Indian astronomical texts give the coordinates of the yogatārās or junction stars of nakṣatras. These coordinates have been interpreted as polar coordinates, which depend on the position of the north celestial pole. Polar coordinates of a star should change with time due to precession. However, different astronomical texts written over many centuries give same coordinates for most yogatārās. This has resulted in Indian astronomers being called incompetent, who did not observe the positions of the stars with accuracy. In this paper it is proposed that Indian astronomers were using sidereal ecliptic coordinates, which does not change with time to a significant extent. Even though sidereal ecliptic coordinates do not change, order of nakṣatras was periodically changed to take into account the movement of vernal equinox due to precession. Ecliptic longitudes were updated by simple addition corresponding to the shift in origin of the nakṣatra system. It is proposed that a mix up of longitudes from different systems has resulted in a list that obfuscates the true understanding of Indian astronomy. To gain a better understanding of coordinates given in Sūryasiddhānta, precise boundaries of nakṣatras have been determined based on the yogatārās of Rohiṇī and Kṛttikā nakṣatras. Using the coordinates of the boundaries, the identifications of yogatārās of nakṣatras have been reassessed. Among the 28 yogatārās, alternative identifications of six yogatārās have been suggested.

中文翻译：

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苏里亚西达塔恒星黄道坐标系

印度的天文文献给出了nakṣatras的Yogatārās或结星的坐标。这些坐标已被解释为极坐标，这取决于北天极的位置。由于进动，恒星的极坐标应随时间而变化。然而，许多世纪以来，不同的天文文献为大多数瑜伽派提供了相同的坐标。这导致印度天文学家被称为无能者，他们没有准确观察到恒星的位置。在本文中，建议印度天文学家使用恒星黄道坐标，该坐标不会随时间变化很大。即使恒星黄道坐标不变，纳科特拉斯的阶数也会定期更改，以考虑进动引起的春分点的移动。通过与nak additionatra系统原点偏移相对应的简单加法来更新黄经度。建议将来自不同系统的经度混合在一起，得出的清单模糊了对印度天文学的真正理解。为了更好地理解苏里雅达达所给出的坐标，已经根据罗伊希蒂（Rohiṇī）和库蒂卡（Kṛttikānakṣatras）的瑜伽经确定了纳科特拉（nakṣatras）的精确边界。使用边界的坐标，已重新评估了纳克塔特拉斯的瑜伽派的身份。在这28个瑜伽派中，有人提出了6个瑜伽派的替代标识。建议将来自不同系统的经度混合在一起，得出的清单模糊了对印度天文学的真正理解。为了更好地理解苏里雅达达所给出的坐标，已经根据罗伊希蒂（Rohiṇī）和库蒂卡（Kṛttikānakṣatras）的瑜伽经确定了纳科特拉（nakṣatras）的精确边界。使用边界的坐标，对nakṣatras的Yogatārās的标识进行了重新评估。在这28个瑜伽派中，有人提出了6个瑜伽派的替代标识。建议将来自不同系统的经度混合在一起，得出的清单模糊了对印度天文学的真正理解。为了更好地理解苏里雅达达所给出的坐标，已经根据罗伊希蒂（Rohiṇī）和库蒂卡（Kṛttikānakṣatras）的瑜伽经确定了纳科特拉（nakṣatras）的精确边界。使用边界的坐标，已重新评估了纳克塔特拉斯的瑜伽派的身份。在这28个瑜伽派中，有人提出了6个瑜伽派的替代标识。