If you liked
Tenohira no Seiza
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...then you might like
Kimi ga Terasu Koi no Hikari
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Both stories are boys love and each manga has a person that's really into stars and astronomy. In TnS, it's about childhood friends that both loved the stars but one forgot about this "passion" and gets reminded yet again, in KgTKnH the people are only customer and employee and one person comes to like the stars because of the other.