Hack-Hook
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Not correct.
First of all lunar or solar does not really matter. Both can be as accurate as the calculations deriving them. The solar is preferred though for stability of its seasonal rotation which makes agriculture easier since farmers know what date they have to start their crops.
Iranian calendar is still Jalali. And contrary to popular concepts has no error since it is an observational calendar. Each year astronomers determine the exact vernal equinox and that becomes the basis for the new year. But its observational property makes the calendar on its last date a bit cumbersome as the date can change for the last day of the year during any hour. The pure calculation based calendar based on Jalali had been proposed by Birashk which would introduce a small error but make the calendar non-observational. The proposal has never been put before Iranian parliament and is not official and is only an academic topic. Iran's current calendar remains observational and each year Tehran observatory calculates the new year based on its observation.
not exactly in Jalali Calendar the number of days in months can vary in different year but in Iran calender that adopted in 1925 they fixed the number of days in the months in different years
On 21 February 1911, the second Persian parliament adopted as the official calendar of Iran the Jalālī solar calendar with months bearing the names of the twelve constellations of the zodiac and the years named for the animals of the duodecennial cycle; it remained in use until 1925.[7] The present Iranian calendar was legally adopted on 31 March 1925, under the early Pahlavi dynasty. The law said that the first day of the year should be the first day of spring in "the true solar year", "as it has been" ever so. It also fixed the number of days in each month, which previously varied by year with the tropical zodiac. It revived the ancient Persian names, which are still used It specified the origin of the calendar (Hegira of Muhammad from Mecca to Medina in 622 CE). It also deprecated the 12-year cycles of the Chinese-Uighur calendar which were not officially sanctioned but were commonly used.