Graha means gravitational body not Planet.
Graha means to hold. The Indian word loosely translated as planet is Graha. It is suggestive of grav-itation.
The word ‘planet’ itself is derived from the word ‘wanderer’ (unlike the fixed stars).
That is why Surya and Chandra are also “grahas”. It is also why Rahu and Ketu are called Chaya (Shadow) Grahas.
The word Graha is used from the earliest days in Indian Texts.
The nine grahas are Surya (Sun), Chandra (Moon), Kuja (Mars), Budha (Mercury), Guru (Jupiter), Sukra (Venus), Sani (Saturn), Rahu and Ketu.
It is wrong to translate the word graha as a planet and then to be crtical of calling Surya and Chandra as grahas. The error is not in our astronomy. The error is in the translation from Sanskrit to English and other languages.
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