Dusk by Ensign February 20, 2021 0 Dusk generally refers to the transition from day to night. Scientists distinguish between three definitions of dusk civil, nautical, and ...
Dwarf Planet by Ensign February 20, 2021 0 A celestial body orbiting the Sun that is massive enough to be rounded by its own gravity but has not ...
Dyne by Ensign February 20, 2021 0 A unit of force equal to the force required to accelerate a 1-g mass 1 cm per second per second. ...
Earthshine by Ensign February 20, 2021 0 Earthshine is a dull glow which sometimes lights up the unlit part of the Moon. It usually occurs a few ...
Eccentricity by Ensign February 20, 2021 0 The distance between the foci of an ellipse divided by the major axis.
Eclipse by Ensign February 20, 2021 0 An event that occurs when the shadow of a planet or moon falls upon a second body. A solar eclipse ...
Eclipsing Binary by Ensign February 20, 2021 0 A binary system where one object passes in front of the other, cutting off some or all of its light.
Ecliptic by Ensign February 20, 2021 0 An imaginary line in the sky traced by the Sun as it moves in its yearly path through the sky.
