Talk:Solar Hijri calendar

"Accuracy" Graph
The graph in the "Accuracy" section could use some labels on it axes. 96.38.164.2 (talk) 06:07, 10 March 2015 (UTC)

SBader (talk) 13:34, 26 April 2015 (UTC)

spellings
Why does the table of month names have a column named "Iranian-English" rather than, say, "Romanized"? —Tamfang (talk) 18:55, 21 October 2015 (UTC) ✅ YBG (talk) 06:08, 22 October 2015 (UTC)

History of calendar
It would be useful to know when this calendar was invented, why it was invented, the significance of it, etc. As it stands this article merely explains that it is a calendar in use in Iran and Afghanistan. — Preceding unsigned comment added by BaronRobie (talk • contribs) 15:29, 2 April 2018 (UTC)

"There is no 37 year cycle in the natural progression."
The following current paragraph is not entirely correct:

"The Solar Hijri calendar produces a five-year leap year interval after about every seven four-year leap year intervals. It usually follows a 33-year cycle with occasional interruptions by single 29-year or 37-year subcycles. The reason for this behaviour is (as explained above) that it tracks the observed vernal equinox. By contrast, some less accurate predictive algorithms are suggestion based on confusion between the average tropical year (365.2422 days, approximated with near 128-year cycles or 2820-year great cycles) and the mean interval between spring equinoxes (365.2424 days, approximated with a near 33-year cycle)."

In fact the natural progression of leap year intervals is entirely made up of 29 year and 33 year cycles. There is no 37 year cycle in the natural progression. Most of the time these cycles will be one 29 year cycle followed by three 33 year cycles, giving us 128 year higher-level cycles. Eventually, this will be interrupted by a 161 year higher-level cycle then return to a series of 128 year higher-level cycles. The exact pattern is difficult to determine mathematically because the true length of the year is constantly changing. The 37 year cycle is an artificial construct that is part of the 2820 year cycle.

The 2820 year cycle is a man-made construct in an attempt to provide a simple set of rules based on a 365 and 683/2820 day year. This number, while close, is not entirely accurate, and (as previously stated) the true length of the year is changing. Even accepting that number as accurate and fixed, the actual progression is 1 x [1x(161 year cycle) + 5x(128 year cycle)] + 3 x [1x(161 year cycle) + 4x(128 year cycle)]. (I've shown the various levels of yearly cycles below for those interested.) The 37 year cycle was invented by someone who wanted to simplify the rules to only 22 higher-level cycles of 128 days. Since this adds up to only 2816, the last 33 year was changed to a 37 year cycle. This scheme does add up in the end, and only shifts the leap year more than a day off a couple times through the 2820 year cycle. But, it is not the progression that occurs naturally when you add an extra day to any year that would have the vernal equinox a day or more off.

1x5 + 6x4 = 29 (7 leap days)

1x5 + 7x4 = 33 (8 leap days)

1x29 + 3x33 = 128 (31 leap days)

1x29 + 4x33 = 161 (39 leap days)

1x161 + 5x128 = 801 (194 leap days)

1x161 + 4x128 = 673 (163 leap days)

1x801 + 3x673 = 2820 (683 leap days)  — Preceding unsigned comment added by Terr1959 (talk • contribs) 11:59, 27 July 2018 (UTC)

Article Name should be changed to Persian Solar Calendar
The name "Hijri calendar" is incorrect, as this is not an Islamic Calendar, it is Persian; The same calendar is used by Zoroastrians/Mazdaic communities (with different references for "Year Zero". Also, this calendar is used for the "Shahanshahi Calendar" which considers "Years Zero" to be the date of the coronation of Cyrus the Great)

Proposing an appropriate name change for this article and all articles which use the misnomer "Hijri":

Name change: Persian Solar calendar

Editors feel free to add comments supporting or opposing name change.

Xoltron (talk) 04:06, 8 March 2019 (UTC)
 * Not specifically Persian, it is also used officially in Afghanistan. Khestwol (talk) 05:31, 8 March 2019 (UTC)
 * One reason for the name Hijri is that the epoch of the calendar is the Hijra. (The Shahanshahi Calendar has a different epoch as you say, so it cannot be correct to say it is the same calendar, All you can say is that it has the same names for the months). Who uses the calendar is irrelevant, although most users are Shia Islam.
 * It seems to me that the reasons you propose for the change are unconvincing. You would need to find good neutral evidence of extensive use of another name to satisfy WP:common name. In the meantime, I have created Persian solar calendar as a redirect to this article.
 * See also the Iranian calendars article. --John Maynard Friedman (talk) 10:12, 8 March 2019 (UTC)
 * What your saying suggests a need for a separate article for the Persian Calendar. If you look at the Wikipedia articles for the individual months of the Persian Calendar (Esfand for example), they are described (incorrectly) as being months of the "Solar Hijri Calendar" with a link to this article. I am not sure the argument that an epoch alone defines a calendar - the months of this calendar, for example, are all 100% Zoroastrian/Persian names, definitely not Islamic...which makes the word "Hijri" in the name highly misleading especially to the novice reader. The argument that "most of the users are Shia" of course doesn't count into this - it's just a coincidence (and this Calendar is also used in Afghanistan, which does not have a significant Shia population)Xoltron (talk)
 * I think the question is what is the commonly recognizable name? Because we only use these names that are known for most of people read here→WP:COMMONNAME. I am not sure but I think most of reliable sources use Solar Hijri calender. You can add (also called Persian calender) to the lead. Thanks.--SharabSalam (talk) 20:47, 8 March 2019 (UTC)
 * Your point on the month names misdirecting is a good one. Maybe they should redirect to a section of Iranian calendars? By the way, Persian calendar redirects to Iranian calendars. --John Maynard Friedman (talk) 10:39, 9 March 2019 (UTC)
 * Re-reading your note, it seems that the month articles themselves need revision, not just fixing the wlinks to the more appropriate target. Please go ahead! --John Maynard Friedman (talk) 10:45, 9 March 2019 (UTC)

Calendar used in Iran from 1976 to 1979
What is the name of the calendar used in Iran from 1976 to 1979? The years in the said calendar can be determined by adding 1180 to the Solar Hijri year. The Gregorian year 2019, for example, corresponds to 1397–1398 in the Solar Hijri calendar. It corresponds to 2577–2578 in the calendar used in Iran from 1976 to 1979. —Jencie Nasino (talk) 00:54, 14 August 2019 (UTC)

Table of worldwide events: WP:BRD discussion
contributed the table below, per WP:BEBOLD. Invoking WP:BRD, I have reverted it pending discussion here. My primary reason is WP:INDISCRIMINATE ("Wikipedia is not an indiscriminate collection of information"). The article is about an Islamic calendar, not various random events that might be of interest to some Iranians and Afghans living in the US, not religious events in the Christian and Hebrew faiths, not whatever happened to occur to the editor who wrote it. It makes sense to give the correspondence of dates as between the SH and CE calendars. It does not make sense to load the article with irrelevant trivia. Discuss. --John Maynard Friedman (talk) 16:57, 5 February 2021 (UTC)

Movable holidays, sports events and annual international cultural events as marked on the Solar Hijri calendar
Given the huge numbers of Iranians and Afghans living in the diaspora outside their home countries, the following guide marks the dates of annual national and international events as marked using the Solar Hijri calendar in force there in both Iran and Afghanistan, as well as movable religious holidays marked by Iranian and Afghan Christians (Catholics of Western and Eastern Rites, Eastern Orthodox, Coptics and Protestants), Taoists and Buddhists living abroad. Those celebrated by Muslims with origins from Iran and Afganistan, as a general rule, follow the Islamic calendar, also called the Lunar Hijri. The Hebrew calendar is used by Iranians and Afghans abroad who profess Judaism (as well as Jews in Afghanistan itself) who celebrate Jewish liturgical festivals as well as several holidays marked in Israel itself. The fixed holidays and observances, as well as select movable national and international observances and holidays, are indicated in the individual articles of each month.

Why title has Hijri in it?
Hijri is for the time prophet Mohammad moved from Madinah to Mecca. why khorshidi calendar has to have the word Hijri in it? 133.11.226.13 (talk) 01:20, 10 March 2023 (UTC)
 * Because the epoch (beginning) of the calendar is the Hijrah. As I'm sure you must know, Shia Islam and Sunni Islam have different traditions. --𝕁𝕄𝔽 (talk) 13:27, 10 March 2023 (UTC)
 * If you meant "why is this article called "Solar Hijri calendar" (rather than just "Solar calendar"), the reason is that there are many solar calendars so a way is needed to identify this one specifically. But also, it not the only calendar that uses the Hijrah as its epoch, so we couldn't just call it the "Hijri calendar" either. We have a policy, Common name, which in a nutshell says that we use the name most widely used in worldwide publications. That explains why Islamic calendar describes the Islamic lunar calendar. By the way, we also have Hijri calendar, a Disambiguation page that explains that there are three possible articles that may be what is wanted. We could have called it "Iranian calendar": if you believe we should do that, you will need to produce many sources that prefer that name. Does that answer your question? --𝕁𝕄𝔽 (talk) 15:11, 10 March 2023 (UTC)

A Commons file used on this page or its Wikidata item has been nominated for deletion
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 * 12Hakhamanish.jpg

Calendar image
Does anyone know with confidence whether this image is a solar or a lunar Hijri calendar? 𝕁𝕄𝔽 (talk) 07:21, 19 April 2024 (UTC)