What the astronomers of the 17th century were able to see at Paris Observatory

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 One of the big questions that has been bordering me for years is what astronomers in the 17th century were able to observe with their instruments given the extremely long focal lengths, the enormous size of these instruments, the weight of managing these telescopes many have wondered what they could observe.
I have discoverd in the Paris observatory library archives many drawings by astronomers at Paris observatory in the middle of the 17th century, great names like Cassini, Maraldi , Rhómer and so one have sketch and kept records of observations. Down below all drawings from 1673 to 1700.

Let's start, so the drawings get more precise from 1673.

1. l'Observatoire royal de Paris, 1673 janvier 1 - 1673 mars 31
































Lunette 34 pieds = 11m refractor 
Lunette 20 pieds = 6.4m refractor 


2. l'Observatoire royal de Paris, 1673 avril 1 - 1673 juillet 26































3. l'Observatoire royal de Paris, 1e janvier 1680 - 25 décembre 1683

















































4. l'Observatoire royal de Paris, 1er janvier 1682 — 17 avril 1683

Equipment used:
1 The 34 feet ( pieds) refractor 11m focal lenght 81mm diameter, the telescope that discoverd the Cassini division and Saturn moon Rhea.
2 The 20 pieds telescope 6.4m long. 
3 The 35 pieds refractor 11.3m.
4 The 21 pieds refractor 6.8m


























































5. l'Observatoire de Paris 21 septembre 1683 - 6 juin 1684




























































6. l'Observatoire de Paris e D32A  6 juin 1684 - 3 mai 1685; D32B  3 mars 1685


























































































7. l'Observatoire de Paris  1er juin 1685 - 31 décembre 1685







































8. l'Observatoire de Paris  1er janvier 1686 - 30 avril 1686
































































9. l'Observatoire de Paris 1er mai 1686 - 31 décembre 1686









































10. l'Observatoire de Paris  1er janvier 1687 - 1er août 1687



































































11. l'Observatoire de Paris  1er août 1687 - 1er juin 1688

















































12. l'Observatoire de Paris 1er juin 1688 - 28 décembre 1688
















































































13. l'Observatorie de Paris 28 decembrie 1688 - 1 novembre 1689










































































































14. l'Observatoire de Paris  1er novembre 1689 - 27 septembre 1690


















































































































15. l'Observatoire de Paris 21 septembre 1690 - 10 janvier 1692







































































































































































































































16. l'Observatoire de Paris 1er janvier 1692 - 26 août 1693




























































































































17. l'Observatoire de Paris 27 août 1693 - 19 mars 1694

















































18. l'Observatoire de Paris 20 mars 1694 - 27 mars 1695

































































19. l'Observatoire de Paris 27 mars 1695 - 31 octobre 1696

















































































































20. l'Observatoire de Paris 1er novembre 1696 - 6 mars 1698
































































21. l'Observatoire de Paris 7 mars 1698 - 25 mai 1699








































22. l'Observatoire de Paris 26 mai 1699 - 15 août 1700


























































































































































































































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