Almanac calculates the equatorial coordinates of the sun, the moon, and the planets. From these it calculates the times of rise, set, and meridian transit for each of these celestial bodies. Additionally, it can calculate the times for twilight
Zeno Interpreter 1.1 This application is an interpreter for the Zeno computer programming languare. It requires Microsoft Windows 95 or later. It includes a text editor for creating, saving, and printing programs.
Description: Almanac gives you the capability to determine the times of rising, setting, and meridian transit for the sun, the moon, and the planets. It also enables you to calculate the beginning and ending of astronomical, nautical, and civil twilight. The results of the calculations are formatted and written into a text editor. You can perform all common editing functions and save the data as a text file.
The formulae used in Almanac assume an ideal horizon where the intersection of the sky with the apparent plane of the earth's surface at the observer is the horizon. For rise/set calculations, the observer has zero elevation so that the horizon is exactly 90 degrees from the local vertical. Refraction of light passing through the earth's atmosphere tends to make objects appear higher in the sky than they actually are. This effect increases as an object's altitude decreases. Almanac assumes average atmospheric conditions in compensating for refraction. Lunar parallax changes the perceived altitude of the moon because the observer is not at the center of the earth. Parallax makes that the moon appears lower in the sky. Almanac compensates for this effect. Parallax for the Sun and planets is small enought to be ignored for this application.
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Across the Sun - the transit of Venus On the morning of Tuesday the 8th of June people across Wales will get an opportunity to ponder one of nature's rarest sights a transit of Venus across the disc of the sun.
Australians Set Scopes on Rare Transit of Venus SYDNEY (Reuters) - Australian stargazers focused their telescopes on the South Pacific's blue sky on Tuesday to witness the rare transit of Venus across the Sun, just as England's Captain James Cook did 235 years ago in Tahiti.