Common fractions written in the greek or egyptian system were too awkward for astronomical calculations . 用希腊人或埃及人那套办法写出来的普通分数很不便于作天文计算。
2.
In india around the 5th century a . d . a sys tem of mathematics that made astronomical calculations easy was developed 在大约公元五世纪的印度，一种计算体系使得天文学的发展变得容易。
3.
Aryabhatta ' s methods of astronomical calculations expounded in his aryabhatta - siddhatha were reliable for practical purposes of fixing the panchanga ( hindu calendar ) 阿雅巴塔在他的《阿雅巴塔? ?释哈塔》解释了他的计算模型，相关的实际用途是用作修正印度历法。
