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.
1 Astronomically speaking, the March equinox occurs when the Sun crosses the celestial equator on its way north along the ecliptic. 2  In the Northern Hemisphere, the March equinox is known as the vernal, or spring, equinox, and marks the start of the spring season.