Cassini’s early studies observations of the Sun

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Cassini’s early studies observations of the Sun
He was the first to observe the shadows of Jupiter’s satellites, years later he compiled a table of the positions of Jupiter’s satellites that was used in 1675 by the Danish astronomer Ole Rømer to establish that the speed of light is finite.
Cassini discovered the Saturnian satellites Iapetus (1671), Rhea (1672), Tethys (1684), and Dione (1684). He also discovered the flattening of Jupiter at its poles (a consequence of its rotation on its axis).
This article is about the apparent motion of planets as observed from a particular vantage point Diurnal Rotation of Venus as Cassini discovered
The first attempt to determine the rotation period of Venus was made in 1666 and ... mentioned anything new about the markings or diurnal spin rate of Venus
Diurnal motion is an astronomical term referring to the apparent daily motion of stars around the Earth
Venus Observational Parameters
Discoverer: Unknown
Discovery Date: Prehistoric
Distance from Earth
Minimum (106 km) 38.2
Maximum (106 km) 261.0
Apparent diameter from Earth
Maximum (seconds of arc) 66.0
Minimum (seconds of arc) 9.7
Maximum visual magnitude -4.6
Mean values at inferior conjunction with Earth
Distance from Earth (106 km) 41.44

Apparent diameter (seconds of arc) 60.2



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