Nowruz, Umar Khayyam, Calendar and Constellations

TL;DR

This paper explores the historical calendar adjustments during Umar Khayyam's era, clarifies the Nowruz solar event, and discusses methods for determining the year's start and month lengths.

Contribution

It offers a detailed analysis of calendar reform factors and corrects misconceptions about the Sun's position at Nowruz in Khayyam's time.

Findings

Identifies reasons for calendar adjustments in Khayyam's period

Provides a corrected understanding of the Sun's position at Nowruz

Details methods for selecting the year's start and month durations

Abstract

This article provides information about the factors that necessitated the need to adjust the calendar during the time of Umar Khayyam, the method of choosing the beginning of the year, and the length of the months. It also attempts to correct the common error associated with @the arrival of the Sun in Aries on Nowruz@.