Merlyn - Date and Time Index and Links

Links within this site :-

Merlyn Home Page - Site Index, E-Mail, Copying
This Page :-
- Links to Printed Media
- Web Links :-
Other pages on this site :-
- Date :-
  - Date Miscellany I - Our Calendars; The Gregorian Calendar; The Non-Year Zero; Century and Millennium; Astronomer's Notation; The First Sunrise
  - Date Miscellany II - Day and Year, Month, Calendar Repeats, Possible Calendars
  - Critical and Significant Dates (ZIP) - including 2000, Critical Periods
  - Calendar Weeks - Week Numbers, UK Tax Weeks, US Tax Weeks
  - Week Number Calculation
  - Leap Years - general, 2000 and others, 1700
  - Annual Holiday Dates - British Isles, North America
  - The Calendrical Works of Rektor Chr. Zeller : The Day-of-Week and Easter Formulae - and Papers of :-
    - 1882, images
    - 1883, images
    - 1885, images
    - 1886, images
- Date and/or Time :-
  - Date and Time Formats - Writing Dates, Date Formats, Time Formats, ISO 8601
  - Date and Time Scales, including Zeroes of Date/Time Scales
  - Date and Day Count - Conversions
  - Calendar and Clocks (uses JavaScript)
  - Critical Times Calculator
- Time :-
  - Time Miscellany - Time, HMS, Zones, etc.
  - Summer Time - UK/EU and elsewhere
  - Leap Seconds
- Easter, etc. :-
- The Year 2000 Problem : 1999→2000 :-
  - Page 1 : Y2k, FlopBack
  - Page 2 : Misc Y2k
  - Page 3 : Food Expiry, Legal, Year 2001, Vaguely Similar Problems
  - Time Dilation
  - References, My work
- Programming :-
  - Date and Time Calculation
  - JavaScript Date and Time, Include Files
  - VBScript Date and Time
  - Pascal Date and Time
  - Delphi Date and Time
  - "The Delphi Magazine" #34 (June 1998)
  - More Turbo Pascal date code, more programs
- Executables :-
  - MJD_DATE, a general DOS date/time program
  - LONGCALC, ZIP, a DOS program with some long-date/time code
  - Source code, for those and for others, is also in the programs/ directory.
- Tables :-
  - A condensed Gregorian Calendar for 1970-2030
  - A more condensed Gregorian Calendar for 1600-2800
  - Set-Back : Year Match Tables for 1980-2030
  - Year-Set : Year Type Tables for 1800-2250
  - A condensed ISO-Week Calendar for 1970-2030
  - Test Data for ISO Week Numbers
  - A condensed UK HMRC Tax Week Calendar for 1970-2030
  - Condensed Easter Tables for 1900-2149
  - DayOfMonth/DayOfWeek Frequency Tables, Gregorian and Julian
  - Some JDN, Gregorian, Julian, English Civil dates
  - A condensed Hebrew Calendar for 5700-6000

Links to Printed Media

General :-

Seen :-
- Whitaker's Almanac
- A modern Encyclopaedia Britannica
- The Delphi Magazine #34 (Jun 1998), pub. iTec, UK
- The Delphi Magazine #?? (Jan 2001), pub. iTec, UK - below
- E.G.Richards, "Mapping Time - The Calendar and its History", OUP 1998, ISBN 0-19-850413-6 (now 2nd Edn, and pbk.). Book & site include algorithms; site has errata (_)
- David Ewing Duncan, "The Calendar", Fourth Estate 1999, ISBN 1-87502-979-8
- Derek Howse, "Greenwich time", OUP 1980, ISBN 0-19-215948-8
- Sir Paul Harvey, "The Oxford Companion to English Literature", 4th Edn., OUP 1967, ISBN 0-19-886106-1, Appendix III, "The Calendar", has information on the British Calendar covering the Second Millennium. Gives the dates of Julian Easter for 1066 to 1752, and of Gregorian Easter for 1583 to 2000; also Regnal Years; etc.
Not seen :-
- Duncan Steel, "Marking Time: The Epic Quest to Invent the Perfect Calendar", Wiley 2000 - said to be good (Robin?)
- Nachum Dershowitz and Edward M. Reingold, "Calendrical Calculations", Cambridge University Press, ISBN 0-521-56474-3 and "Calendrical Calculations, The Millennium Edition", 2001, ISBN 0-521-77752-6, 0-521-77167-6 pbk - said to be good
- I have repeatedly read that "Astronomical Algorithms" (2nd ed, Dec '98) by Jean Meeus, Willmann-Bell Publishers, ISBN 0-943396-61-1, is a good reference
- Explanatory Supplement to the Astronomical Almanac, edited by P. Kenneth Seidelmann, University Science Books, Sausalito, CA 94965, USA.

Leap Year and Easter:-

The Papal Bull
The British Calendar Acts
The Book of Common Prayer of the Church of England (for after the change to Gregorian in 1752)
any reputable encyclopaedia

Leap Year :-

Isaac Asimov, "More Tales of the Black Widowers", Chap. X, "Friday the Thirteenth"
"Communications of the ACM, algorithm number 199, originally submitted by Robert G. Tantzen in the August, 1963 issue (Volume 6, Number 8)"

Web Links

The classifications are inexact; the order is somewhat arbitrary.

Adapted from a mail from Henk Reints on 2007-12-12 :

As you may have already found out, Rodolphe Audette's website http://hermes.ulaval.ca/~sitrau/calgreg/calgreg.html is down.

He agreed to my (temporary) republication of his pages ...

For the moment, I've not changed my links. Go to Reints-Audette.

The Papal Bull Inter Gravissimas :-

Papal Encyclicals - a list - links to Bluewaterarts for the Bull
The Bull in Latin (L) and English (E) at ecu.edu
The Bull in Latin/French/English (LFE) at bluewaterarts
The Bull at ISO, as at bluewaterarts
The Bull in Latin (#), plus Sequitur declaratio ..., at The Latin Library
Rodolphe Audette's site was at ulaval.ca:-
- Les textes constitutifs du calendrier grégorien
- The Bull in Latin/French
- Synopsis of Lilius' work, issued c.1577 by the calendar commission : Compendium novæ rationis restituendi calendarium (L/F)
Les textes fondateurs du calendrier grégorien by Rodolphe Audette (Latin and French) (bull and canons) (at henk-reints.nl)
Images of pages of Opera Mathematica of Christoph Clavius (1612). The Explicatio — Romani calendarij à Gregorio XIII. P. M. restituti explicatio (1603) — is included in the fifth volume
Inter gravissimas - Wikipedia

The British Calendar Acts :-

Authoritative : search for "Calendar Act" in the UK Statute Law Database site for legislation as current (database published 2006-12-20) - includes images (large) of "Prayer Book" material cited in Section 3 of the first Act, presently placed at the end of Section 6.
Direct : http://www.statutelaw.gov.uk/content.aspx?ActiveTextDocId=1516754
Currently (Apr 2008) its Easter Table pages do not agree with the current Prayer Book - see details
Office of Public Sector Information - like Database.
The original Calendar Act 1751 - as images, 16pp, no Tables, Google Books.
An act for regulating the commencement of the year; and for correcting the calendar now in use, Statutes at Large 1765, with Easter tables, Google Books
Gilbert Healton's site has the Act (A), some Tables (T), and Notes (N); copy of Act at webexhibits
Mark Brader's transcription at tafkac (A); others seem to be copies of this
Lex Scripta, Anthony J H Morris :-
- The Year of Grace, 1751 - on Calendars
- The Act of 1751
- Etc.

The Gregorian Reform :-

Any remaining links in my pages :-

Leap Years
The Date of Easter Sunday
The Calculation of Easter Sunday from the Book of Common Prayer of the Church of England
and various parts of others below ...

Other links may be found on specific pages.

In my Time Miscellany page - Time Zone Links

The International Earth Rotation Service, in France; IERS's Leap Second bulletin.

BIPM Home

NPL, UK :-

Time and Frequency - FAQ
Time Scales
Summer Time
Leap Seconds
Computer Time Services
Phoneclock - to get the true UK TIME, with a modem and a PC

Joseph Myers - History of legal time in Britain (*)

NMM, UK Time & timekeeping - good.

UK Summer Time, at NMM

Leap Seconds, at NMM, UK

Stephen Tonkin - Time - relationships between Solar, Sidereal, UT, etc.

Sci.astro FAQ : [sci.astro] Time (Astronomy Frequently Asked Questions) (3/9) - includes GMT, UT, UT0, UT1, UT2, UTC, DUT1, ET, TT, TDT, TBT, TAI

NRC, Canada Time Services FAQ

At the US Naval Observatory (USNO) :-

a good Time FAQ, linking to
an explanation of TAI, UT, UT0, UT1, UTC, TT, TDT, TDB, TCG, & TCB; also JDN & MJD
What is Universal Time?
Tycho,
the U.S. National Earth Orientation Service, via Earth Orientation Department

Paul Schlyter - Timescales

Time Scales - Steve Allen (Lick), exhaustive.

Decimal Time Links - and others, by John D. Hynes. JD, MJD, TJD, etc.

Paul Nagai - Internet Clocks, Counters, and Countdowns

NTP : The Network Time Protocol

Primoz Gabrijelcic : Time Is The Simplest Thing - The Delphi Magazine, Jan 2001

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This site, http://www.merlyn.demon.co.uk/, is maintained by me.

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