30. The [[6]]artificial day at each Pole of Venus is as long as 1121⁄2 [[7]]natural days on our Earth.
Her Tropics and polar Circles, how situated.
31. The Sun’s greatest Declination on each side of her Equator amounts to 75 degrees; therefore her[[8]] Tropics are only 15 degrees from her Poles; and her [[9]]Polar Circles as far from her Equator. Consequently, the Tropics of Venus are between her Polar Circles and her Poles; contrary to what those of our Earth are.
The Sun’s daily Course.
32. As her annual Revolution contains only 91⁄4 of her days, the Sun will always appear to go through a Sign, or twelfth Part of her Orbit, in little more that three quarters of her natural day, or nearly in 183⁄4 of our days and nights.
And great declination.
33. Because her day is so great a part of her year, the Sun changes his Declination in one day so much, that if he passes vertically, or directly over head of any given place on the Tropic, the next day he will be 26 degrees from it: and whatever place he passes vertically over when in the Equator, one day’s revolution will remove him 361⁄4 degrees from it. So that the Sun changes his Declination every day in Venus about 14 degrees more at a mean rate, than he does in a quarter of a year on our Earth. This appears to be providentially ordered, for preventing the too great effects of the Sun’s heat (which is twice as great on Venus as on the Earth) so that he cannot shine perpendicularly on the same places for two days together; and by that means, the heated places have time to cool.
To determine the points of the Compass at her Poles.
34. If the inhabitants about the North Pole of Venus fix their South, or Meridian Line, through that part of the Heavens where the Sun comes to his greatest Height, or North Declination, and call those the East and West points of their Horizon, which are 90 degrees on each side from that point where the Horizon is cut by the Meridian Line, these inhabitants will have the following remarkables.
Surprising appearances at her Poles;