地上からの観測
nDark and light spot on the disk
[Cassini, 1666-1667]
nDark and light region map
[Biancini, 1726]
n赤外観測; 320-330K (dayside), 250-270K (nightside) [Pettit and Nicholson,
1924; Coblentz
and Lampland, 1924,1925]
nCloud feature (写真,黄色,60cm反射望遠鏡) [Dollfus, 1953]
図は “the planet VENUS” edited by Mikhail, Y. et al. より