A noun is a type of word the meaning of which determines reality. Nouns provide the names for all things: people, objects, sensations, feelings, etc. what does micrometeoroid mean in english? Micrometeoroid A micrometeoroid is a tiny meteoroid; a small particle of rock in space, usually weighing less than a gram.
During Equinoxes the tilt of the Earth (with respect to the Sun) is 0Â° and because of it duration of the day and the night are almost equal on Equinox day i.e. 12 hours. Equinoxes occur on 20th or 21st March and 22nd or 23rd September each year and both days has equal length of the day and the night.
The March equinox may be taken to mark the beginning of spring and the end of winter in the Northern Hemisphere but marks the beginning of autumn and the end of summer in the Southern Hemisphere. In astronomy, the March equinox is the zero point of sidereal time and, consequently, right ascension.