The ratio between the height of an object or surface and the length of its shadow on a plane.
Popular term for a meteor. See meteor.
Time period that takes place between one solar noon and the next. Although defined as 24 hours, in solar time most days are slightly longer than 24 hours.Time and Date
An event that occurs when the sun crosses the meridian of the location and reaches the highest point in the sky. In most places, it doesn’t happen at 12 noon. Time and Date
Constant flow of high-energy particles (mostly electrons and protons) that come out of the sun at high speed and temperature. The auroras are caused by the interaction of the solar wind and our atmosphere. Time and Date
Event that occurs twice a year (June and December solstice) when the sun is exactly above the Tropic of Cancer or the Tropic of Capricorn. The winter solstice is the shortest day of the year and traces the lowest arc in the sky, while the summer solstice is the longest, tracing the highest arc.
Half of the Earth that lies south of the equator. Wikipedia.
Line, arc, or circle that draws a star in the night sky in a photo using a long exposure on a fixed-mount camera, it is caused by the Earth’s rotation on its axis in which it appears that it is the stars that slowly rotate in the sky. Wikipedia.
Time required by the moon to pass through all its phases, measured from the new moon to the next. Also known as lunar month or lunation. Time and Date
Event that marks the beginning of summer, with the longest day of the year and the shortest night. In the northern hemisphere, it occurs in June, while in the southern hemisphere it occurs in December. Time and Date
Star at the center of our Solar System. Wikipedia.