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A Few Common Misconceptions in Historical Astronomy by Barry D
A Few Common Misconceptions in Historical Astronomy By Barry D. Malpas – Special to the Williams-Grand Canyon News – 2014 September Did Galileo Invent the Telescope? Credit for the invention of the telescope is given to the Dutch lens maker Johann Lippershey (ca. 1570- 1619) in the year 1608, who tried to market them as military devices to the Dutch Government. Galileo, hearing about the invention through his correspondences with other scientists in Europe, built his first telescope in one evening, during the fall of 1609. Galileo too recognized the military significance of the telescope, but he also compre- hended its scientific importance, applying it to the Moon and planets, hence expanding humankind's understanding of the Universe. This use advanced astronomy as a modern science and provided its most important research instrument. Has Polaris Always Been the North Star? As the Earth spins on its axis like a giant top, it also slowly wobbles like one, completing one cycle in a period of about 26,000 years. This circular wobble is known as Precession, and is the movement of the direction in the sky to where the Earth’s axis points. At present, it points very close to the star Polaris. However, 5,000 years ago when Stonehenge in England and the Great Pyramid at Giza, Egypt, were being constructed, the Earth’s north polar axis pointed to Thuban, a star in the constellation Draco. About 12,000 years from now the axis will circle its way around towards the bright star Vega, in the constellation Lyra. (Note both Thuban and Vega on the sky chart.) Was the Earth Considered Flat When Columbus Discovered the New World? This misconception was generally true for the unschooled masses, but not so for anyone who had received an education. -
2020-2021 Districtwide School Year Calendar
FINAL 2020 – 2021 Districtwide School Year Calendar AUGUST FEBRUARY 2020-21 Calendar M T W T F M T W T F 3 4 5 6 7 1 2 3 4 5 Aug 17 Professional Meeting Day. No Students 8 Aug 18 -21 Staff Professional Development Day. 10 11 12 13 14 9 10 11 12 M No Students. Aug 24 Schools Open. Students Report. 17 18 19 20 21 15 16 17 18 19 Sept 7 Labor Day. Holiday. Schools Closed Sep 14 Midterm Week 24 25 26 27 28 22 23 24 25 26 Sep 21 –Oct 9 Fall Gifted Screening 31 Sep 28- Oct 9 INVIEW / Terra Nova (Elementary) Oct 14 PSAT (High Schools) Oct 16 End of First Quarter. Students Report. SEPTEMBER MARCH (39 Instructional Days, 44 Staff Days). M T W T F M T W T F Oct 21 – 27 3rd Grade Fall ELA. 1 2 3 4 1 2 3 4 5 Nov 2 Conference Comp Day –School Closed Nov 3 Election Day – Conference Day. 7 8 9 10 11 8 9 10 11 12 Q No Students. 14 M 15 16 17 18 15 16 17 18 19 Nov 9 Midterm Week 21 22 23 24 25 22 23 24 25 26 Nov 11 Veterans’ Day. Holiday Observance. Schools Closed. 28 29 30 29 30 31 Nov 25 Conference Day. No Students. Nov 26 Thanksgiving. Holiday Observance. OCTOBER APRIL Nov 27 Schools Closed. Dec 1 – 11 Fall HS End of Course M T W T F M T W T F Dec 14 -18 Semester 1 Exams (High Schools) 1 2 1 2 Dec 18 End of Second Quarter. -
Printable Celestial Navigation Work Forms
S T A R P A T H ® S c h o o l o f N a v i g a t i o n PRINTABLE CELESTIAL NAVIGATION WORK FORMS For detailed instructions and numerical examples, see the companion booklet listed below. FORM 104 — All bodies, using Pub 249 or Pub 229 FORM 106 — All Bodies, Using NAO Tables FORM 108 — All Bodies, Almanac, and NAO Tables FORM 109 — Solar Index Correction FORM 107 — Latitude at LAN FORM 110 — Latitude by Polaris FORM 117 — Lat, Lon at LAN plus Polaris FORM 111 — Pub 249, Vol. 1 Selected Stars Other Starpath publications on Celestial Navigation Celestial Navigation Starpath Celestial Navigation Work Forms Hawaii by Sextant How to Use Plastic Sextants The Star Finder Book GPS Backup with a Mark 3 Sextant Emergency Navigation Stark Tables for Clearing the Lunar Distance Long Term Almanac 2000 to 2050 Celestial Navigation Work Form Form 104, All Sights, Pub. 249 or Pub. 229 WT h m s date body Hs ° ´ WE DR log index corr. 1 +S -F Lat + off - on ZD DR HE DIP +W -E Lon ft - UTC h m s UTC date / LOP label Ha ° ´ GHA v Dec d HP ° ´ moon ° ´ + 2 hr. planets hr - moon GHA + d additional ° ´ + ´ altitude corr. m.s. corr. - moon, mars, venus 3 SHA + stars Dec Dec altitude corr. or ° ´ or ° ´ all sights v corr. moon, planets min GHA upper limb moon ° ´ tens d subtract 30’ d upper Ho units d ° ´ a-Lon ° ´ d lower -W+E dsd dsd T LHA corr. + Hc 00´ W / 60´ E ° d. -
The Mathematics of the Chinese, Indian, Islamic and Gregorian Calendars
Heavenly Mathematics: The Mathematics of the Chinese, Indian, Islamic and Gregorian Calendars Helmer Aslaksen Department of Mathematics National University of Singapore [email protected] www.math.nus.edu.sg/aslaksen/ www.chinesecalendar.net 1 Public Holidays There are 11 public holidays in Singapore. Three of them are secular. 1. New Year’s Day 2. Labour Day 3. National Day The remaining eight cultural, racial or reli- gious holidays consist of two Chinese, two Muslim, two Indian and two Christian. 2 Cultural, Racial or Religious Holidays 1. Chinese New Year and day after 2. Good Friday 3. Vesak Day 4. Deepavali 5. Christmas Day 6. Hari Raya Puasa 7. Hari Raya Haji Listed in order, except for the Muslim hol- idays, which can occur anytime during the year. Christmas Day falls on a fixed date, but all the others move. 3 A Quick Course in Astronomy The Earth revolves counterclockwise around the Sun in an elliptical orbit. The Earth ro- tates counterclockwise around an axis that is tilted 23.5 degrees. March equinox June December solstice solstice September equinox E E N S N S W W June equi Dec June equi Dec sol sol sol sol Beijing Singapore In the northern hemisphere, the day will be longest at the June solstice and shortest at the December solstice. At the two equinoxes day and night will be equally long. The equi- noxes and solstices are called the seasonal markers. 4 The Year The tropical year (or solar year) is the time from one March equinox to the next. The mean value is 365.2422 days. -
Ocean Data Standards
Manuals and Guides 54 Ocean Data Standards Volume 2 Recommendation to Adopt ISO 8601:2004 as the Standard for the Representation of Date and Time in Oceanographic Data Exchange UNESCO Manuals and Guides 54 Ocean Data Standards Volume 2 Recommendation to Adopt ISO 8601:2004 as the Standard for the Representation of Date and Time in Oceanographic Data Exchange UNESCO 2011 IOC Manuals and Guides, 54, Volume 2 Version 1 January 2011 For bibliographic purposes this document should be cited as follows: Paris. Intergovernmental Oceanographic Commission of UNESCO. 2011.Ocean Data Standards, Vol.2: Recommendation to adopt ISO 8601:2004 as the standard for the representation of dates and times in oceanographic data exchange.(IOC Manuals and Guides, 54, Vol. 2.) 17 pp. (English.)(IOC/2011/MG/54-2) © UNESCO 2011 Printed in France IOC Manuals and Guides No. 54 (2) Page (i) TABLE OF CONTENTS page 1. BACKGROUND ......................................................................................................................... 1 2. DATE AND TIME FOR DATA EXCHANGE ......................................................................... 1 3. INTERNATIONAL STANDARD ISO 8601:2004 .............................................................. 1 4. DATE AND TIME REPRESENTATION................................................................................ 2 4.1 Date ................................................................................................................................................. 2 4.2 Time ............................................................................................................................................... -
Islamic Calendar from Wikipedia, the Free Encyclopedia
Islamic calendar From Wikipedia, the free encyclopedia -at اﻟﺘﻘﻮﻳﻢ اﻟﻬﺠﺮي :The Islamic, Muslim, or Hijri calendar (Arabic taqwīm al-hijrī) is a lunar calendar consisting of 12 months in a year of 354 or 355 days. It is used (often alongside the Gregorian calendar) to date events in many Muslim countries. It is also used by Muslims to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the pilgrimage to Mecca. The Islamic calendar employs the Hijri era whose epoch was Islamic Calendar stamp issued at King retrospectively established as the Islamic New Year of AD 622. During Khaled airport (10 Rajab 1428 / 24 July that year, Muhammad and his followers migrated from Mecca to 2007) Yathrib (now Medina) and established the first Muslim community (ummah), an event commemorated as the Hijra. In the West, dates in this era are usually denoted AH (Latin: Anno Hegirae, "in the year of the Hijra") in parallel with the Christian (AD) and Jewish eras (AM). In Muslim countries, it is also sometimes denoted as H[1] from its Arabic form ( [In English, years prior to the Hijra are reckoned as BH ("Before the Hijra").[2 .(ﻫـ abbreviated , َﺳﻨﺔ ﻫِ ْﺠﺮﻳّﺔ The current Islamic year is 1438 AH. In the Gregorian calendar, 1438 AH runs from approximately 3 October 2016 to 21 September 2017.[3] Contents 1 Months 1.1 Length of months 2 Days of the week 3 History 3.1 Pre-Islamic calendar 3.2 Prohibiting Nasī’ 4 Year numbering 5 Astronomical considerations 6 Theological considerations 7 Astronomical -
2021-22 Official District Calendar
Perrysburg AMENDED JUNE 21, 2021 Public Schools Tuesday August 10 HPI - Grade 6 orientation, Junior High Orientation 2021-2022 Wednesday August 11 JH &HPI (grade 5) orientation Thursday August 12 Teacher Inservice School Year Calendar Friday August 13 Teacher Inservice Monday August 16 Teacher Inservice/Workday Tuesday-Thursday August 17-19 Elementary - Jacket Jump Start Appointments Tuesday August 17 HS-Freshman only attend, JH-Grade 8 only attend, HPI-Grade 6 only attend AUGUST 2021 SEPTEMBER 2021 OCTOBER 2021 Wednesday August 18 HS-Freshman only attend, JH-Grade 7 only attend, HPI-Grade 5 only attend M T W T F M T W T F M T W T F Thursday August 19 All High School, Junior High and HPI attend school 2 3 4 5 6 1 2 3 1 Thursday August 19 High School Open House - evening Elementary - First day 9 10 11 12 13 6 7 8 9 10 4 5 6 7 8 Friday August 20 Monday August 23 Preschool First Day 16 17 18 19 20 13 14 15 16 17 11 12 13 14 15 1 Thursday August 26 Junior High Open House - evening 23 24 25 26 27 20 21 22 23 24 18 19 20 21 22 Monday September 6 Labor Day - No School Preschool-12 30 31 27 28 29 30 25 26 27 28 29 Thursday September 23 High School Evening Conferences NOVEMBER 2021 DECEMBER 2021 JANUARY 2022 Friday October 15 End of first quarter M T W T F M T W T F M T W T F Monday & Wed. -
Critical Analysis of Article "21 Reasons to Believe the Earth Is Young" by Jeff Miller
1 Critical analysis of article "21 Reasons to Believe the Earth is Young" by Jeff Miller Lorence G. Collins [email protected] Ken Woglemuth [email protected] January 7, 2019 Introduction The article by Dr. Jeff Miller can be accessed at the following link: http://apologeticspress.org/APContent.aspx?category=9&article=5641 and is an article published by Apologetic Press, v. 39, n.1, 2018. The problems start with the Article In Brief in the boxed paragraph, and with the very first sentence. The Bible does not give an age of the Earth of 6,000 to 10,000 years, or even imply − this is added to Scripture by Dr. Miller and other young-Earth creationists. R. C. Sproul was one of evangelicalism's outstanding theologians, and he stated point blank at the Legionier Conference panel discussion that he does not know how old the Earth is, and the Bible does not inform us. When there has been some apparent conflict, either the theologians or the scientists are wrong, because God is the Author of the Bible and His handiwork is in general revelation. In the days of Copernicus and Galileo, the theologians were wrong. Today we do not know of anyone who believes that the Earth is the center of the universe. 2 The last sentence of this "Article In Brief" is boldly false. There is almost no credible evidence from paleontology, geology, astrophysics, or geophysics that refutes deep time. Dr. Miller states: "The age of the Earth, according to naturalists and old- Earth advocates, is 4.5 billion years. -
The Throughput Year Clock: Defining “One Year” for AB 705
The Throughput Year Clock: Defining “one year” for AB 705 December 2020 | www.rpgroup.org The term “throughput” refers to the percentage of a student cohort who complete a course sequence within a set period after having begun that sequence at the same point in time. Under AB 705 the set period for observing throughput rates is described in law as “one year”. While that time frame seems intuitive enough, the operational definition of “one year” (or the “year clock”) has varied somewhat across sources. For instance, the operational definition of the year clock used by MMAP has evolved over time and been refined. This document provides an overview of how the MMAP team defined the year clock prior to September 2020, as well as a revised definition of the year clock that the team implemented in September 2020. Additionally, it is argued that consistency across cohorts of students with different starting terms within reports is more critical than maintaining a problematic definition simply for future reports to use the same definition as historical reports. Previously Used Throughput Timeframes For the purposes of AB 705 research, a year has been defined as two primary terms plus one or two minor terms or three primary terms (for quarter-based colleges). A minor term such as summer or winter intersession may be included in the three primary term sequence because its inclusion is necessary to satisfy the three primary terms requirement. Summer is a minor term for both the quarter and semester systems, whereas winter intersession is only considered a minor term for semester systems. -
2021-2022 School Year Calendar June 2021 June 21-July 29 - Summer School 17 - Martin Luther King Jr
2021-2022 School Year Calendar June 2021 June 21-July 29 - Summer school 17 - Martin Luther King Jr. Day January 2022 (Fridays off) S M T W T F S 27 - Second Quarter Ends S M T W T F S 1 2 3 4 5 28 - Teacher Record Keeping Day 1 6 7 8 9 10 11 12 31 - Third Quarter Begins 2 3 4 5 6 7 8 13 14 15 16 17 18 19 9 10 11 12 13 14 15 20 21 22 23 24 25 26 16 17 18 19 20 21 22 27 28 29 30 23 24 25 26 27 28 29 30 31 July 2021 4 - Independence Day S M T W T F S June 21-July 29 - Summer school 21 - Presidents Day February 2022 (Fridays off) 1 2 3 22 - Parent Teacher Conferences S M T W T F S 4 5 6 7 8 9 10 1 2 3 4 5 11 12 13 14 15 16 17 6 7 8 9 10 11 12 18 19 20 21 22 23 24 13 14 15 16 17 18 19 25 26 27 28 29 30 31 20 21 22 23 24 25 26 27 28 August 2021 19-20 - New Teacher Orientation* S M T W T F S Aug. 23-Sept. 3 - Teacher Prep/PD Days* 31 - Third Quarter Ends March 2022 1 2 3 4 5 6 7 S M T W T F S 8 9 10 11 12 13 14 1 2 3 4 5 15 16 17 18 19 20 21 6 7 8 9 10 11 12 22 23 24 25 26 27 28 13 14 15 16 17 18 19 29 30 31 20 21 22 23 24 25 26 27 28 29 30 31 September 2021 Aug. -
Calculating Percentages for Time Spent During Day, Week, Month
Calculating Percentages of Time Spent on Job Responsibilities Instructions for calculating time spent during day, week, month and year This is designed to help you calculate percentages of time that you perform various duties/tasks. The figures in the following tables are based on a standard 40 hour work week, 174 hour work month, and 2088 hour work year. If a recurring duty is performed weekly and takes the same amount of time each week, the percentage of the job that this duty represents may be calculated by dividing the number of hours spent on the duty by 40. For example, a two-hour daily duty represents the following percentage of the job: 2 hours x 5 days/week = 10 total weekly hours 10 hours / 40 hours in the week = .25 = 25% of the job. If a duty is not performed every week, it might be more accurate to estimate the percentage by considering the amount of time spent on the duty each month. For example, a monthly report that takes 4 hours to complete represents the following percentage of the job: 4/174 = .023 = 2.3%. Some duties are performed only certain times of the year. For example, budget planning for the coming fiscal year may take a week and a half (60 hours) and is a major task, but this work is performed one time a year. To calculate the percentage for this type of duty, estimate the total number of hours spent during the year and divide by 2088. This budget planning represents the following percentage of the job: 60/2088 = .0287 = 2.87%. -
How Long Is a Year.Pdf
How Long Is A Year? Dr. Bryan Mendez Space Sciences Laboratory UC Berkeley Keeping Time The basic unit of time is a Day. Different starting points: • Sunrise, • Noon, • Sunset, • Midnight tied to the Sun’s motion. Universal Time uses midnight as the starting point of a day. Length: sunrise to sunrise, sunset to sunset? Day Noon to noon – The seasonal motion of the Sun changes its rise and set times, so sunrise to sunrise would be a variable measure. Noon to noon is far more constant. Noon: time of the Sun’s transit of the meridian Stellarium View and measure a day Day Aday is caused by Earth’s motion: spinning on an axis and orbiting around the Sun. Earth’s spin is very regular (daily variations on the order of a few milliseconds, due to internal rearrangement of Earth’s mass and external gravitational forces primarily from the Moon and Sun). Synodic Day Noon to noon = synodic or solar day (point 1 to 3). This is not the time for one complete spin of Earth (1 to 2). Because Earth also orbits at the same time as it is spinning, it takes a little extra time for the Sun to come back to noon after one complete spin. Because the orbit is elliptical, when Earth is closest to the Sun it is moving faster, and it takes longer to bring the Sun back around to noon. When Earth is farther it moves slower and it takes less time to rotate the Sun back to noon. Mean Solar Day is an average of the amount time it takes to go from noon to noon throughout an orbit = 24 Hours Real solar day varies by up to 30 seconds depending on the time of year.