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2. Planetary hours - Wikipedia

   en.wikipedia.org/wiki/Planetary_hours

   v. t. e. The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other ...

3. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   This picture shows clockwise from top left: An Arithmometer, a Comptometer, a Dalton adding machine, a Sundstrand, and an Odhner Arithmometer. A mechanical calculator, or calculating machine, is a mechanical device used to perform the basic operations of arithmetic automatically, or (historically) a simulation such as an analog computer or a ...

4. Equation of time - Wikipedia

   en.wikipedia.org/wiki/Equation_of_time

   The United States Naval Observatory states "the Equation of Time is the difference apparent solar time minus mean solar time", i.e. if the sun is ahead of the clock the sign is positive, and if the clock is ahead of the sun the sign is negative. [6] [7] The equation of time is shown in the upper graph above for a period of slightly more than a ...

5. Sunrise equation - Wikipedia

   en.wikipedia.org/wiki/Sunrise_equation

   Sunrise equation. A contour plot of the hours of daylight as a function of latitude and day of the year, using the most accurate models described in this article. It can be seen that the area of constant day and constant night reach up to the polar circles (here labeled "Anta. c." and "Arct. c."), which is a consequence of the earth's inclination.

6. Play Just Words Online for Free - AOL.com

   www.aol.com/games/play/masque-publishing/just-words

   Play Just Words free online! By Masque Publishing. Advertisement. board. card. casino. If you love Scrabble, you'll love the wonderful word game fun of Just Words.

7. Hour angle - Wikipedia

   en.wikipedia.org/wiki/Hour_angle

   The hour angle is indicated by an orange arrow on the celestial equator plane. The arrow ends at the hour circle of an orange dot indicating the apparent place of an astronomical object on the celestial sphere. In astronomy and celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's axis and the ...