Editing Solar calendar (section)

===Tropical solar calendars===
{{Expand section|date=January 2017}}
If the position of the Earth in its orbit around the Sun is reckoned with respect to the [[Equinox]], the point at which the orbit crosses the celestial equator, then its dates accurately indicate the [[season]]s, that is, they are synchronized with the [[declination]] of the Sun. Such a calendar is called a '''tropical solar calendar''' {{cn|date=November 2017}}..

The duration of the ''mean'' calendar year of such a calendar approximates some form of the [[tropical year]], usually either the [[mean tropical year]] or the [[vernal equinox year]].

The following are tropical solar calendars:
*Ancient Armenian calendar
*[[Bengali calendar]] (National and official calendar in Bangladesh)
*[[Gregorian calendar]]
*[[Iranian calendar]] (Jalāli calendar)
**[[Tabarian calendar]] (Tabarian calendar)
*[[Indian national calendar]] (Saka calendar)
*[[French Republican calendar]]

Every one of these calendars has a year of 365 days, which is occasionally extended by adding an extra day to form a [[leap year]], a method called "[[Intercalation (timekeeping)|intercalation]]", the inserted day being "intercalary".

The [[Baháʼí calendar]], another example of a solar calendar, always begins the year on the [[March equinox|vernal equinox]] and sets its intercalary days so that the following year also begins on the vernal equinox. The moment of the vernal equinox in the northern hemisphere is determined using the location of [[Tehran]] "by means of astronomical computations from reliable sources".<ref name="UHJ1">{{cite web | title = To the Bahá'ís of the World | last = The Universal House of Justice | url = http://universalhouseofjustice.bahai.org/activities-bahai-community/20140710_001 | date = 2014-07-10 | access-date = 2014-07-10}}</ref>