Timeline for How did Khayyam calculate the year so accurately?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 28, 2020 at 18:08 | comment | added | sand1 | @gktscrk added a paper with further refs. btw the question is actually unsourced also. | |
| Aug 28, 2020 at 8:57 | answer | added | sand1 | timeline score: 5 | |
| S Aug 27, 2020 at 21:29 | history | suggested | Spencer |
More appropriate tags
|
|
| Aug 27, 2020 at 18:56 | answer | added | Alexandre Eremenko | timeline score: -1 | |
| Aug 27, 2020 at 12:01 | comment | added | Carl Witthoft | Time passes differently in Xanadu :-) | |
| Aug 27, 2020 at 9:53 | comment | added | sand1 | It seems however that the 2820 cycle is a modern (XX.c) invention, while 128=29+33+33+33 is much older, see the history arxiv.org/ftp/arxiv/papers/1111/1111.4926.pdf | |
| Aug 26, 2020 at 21:14 | comment | added | sand1 | It is called the Jalali calendar and there some pages in French about it. A partial answer is that there is an observational basis, the vernal equinox being tracked precisely: if it is before noon then it's new year's day, if it is later then the new year starts the following day. Next there are cycles of 29 and 33 years comprising 7 or 8 leap years and they follow in a series 29,33,33,33,29,33... for a run of 22 repetitions with the last term being 37 instead of 33. The total reckoning is 683 leap years in a series of 2820 that is 2820*365 +683 = 1,029,983. Some important details are missing. | |
| Aug 26, 2020 at 18:42 | review | Suggested edits | |||
| S Aug 27, 2020 at 21:29 | |||||
| Aug 26, 2020 at 14:45 | history | edited | Big Brother |
edited tags
|
|
| Aug 26, 2020 at 14:16 | review | First posts | |||
| Aug 26, 2020 at 14:45 | |||||
| Aug 26, 2020 at 14:14 | history | asked | CaptainCodeman | CC BY-SA 4.0 |