| 25 October 1671 |
France
|
Astronomy
|
Cassini discovers Saturn's moon Iapetus
|
| 25 October 1671 |
France
|
Astronomy
|
A second Saturnian moon enters the record
|
| 25 October 1671 |
France
|
Astronomy
|
Iapetus's unusual visibility invites study
|
| 25 October 1671 |
France
|
Astronomy
|
Saturn observation reveals a new orbiting body
|
| 7 November 1631 |
France
|
Astronomy
|
Gassendi observes Mercury cross the Sun
|
| 7 November 1631 |
France
|
Astronomy
|
Prediction meets a visible transit
|
| 7 November 1631 |
France
|
Astronomy
|
Mercury looks smaller than expected
|
| 7 November 1631 |
France
|
Astronomy
|
A telescope records a rare alignment
|
