Can someone shorten these definitions? illuminate​ Supply with or brighten with light.

stable ​​ Firmly established; not changing, moving, or fluctuating.

rotate​​ move around a center, or axis

solar day​ The time that the earth takes to make one complete rotation relative to the sun. It is 24 hours.

longitude​ The distance in degrees measured east or west of the prime meridian; expressed either in degrees or in time. (Lines of longitude are 15 degrees for telling time.)

meridian​ An imaginary line running in a circle around the earth through the poles. The Prime Meridian runs through Greenwich, England.

autumnal equinox. ​On or about September 22, when the days and nights are equal.

ellipse​ An egg-shaped orbit of a heavenly body. The shape of the earth’s orbital path around the sun

galaxy. ​One of billions of heavenly systems consisting of numerous stars. An example is the Milky Way.

orbit​ The curved pathway of a heavenly body through space.
vernal equinox​The spring equinox, on about March 21, when days and nights are of equal length.

eclipse. ​​Complete or partial blocking of light passing from one heavenly body to another, causing the darkening of one heavenly body by a shadow.

penumbra​ The lightest part of the shadow (around the edges) outside of the complete shadow formed during an eclipse.

umbra​​ The darkest part of the shadow formed during an eclipse.

Vernal ​​means “of spring”

Total lunar eclipse​ when the mood is entirely immersed within the umbral shadow. In a lunar eclipse, the moon appears to be darkened because the earth is casting a shadow on it.