Presentation on theme: " A round object, like a globe. In space, a planet, moon or star. Origin: 1250–1300; < LL sphēra, L sphaera globe < Gk sphaîra ball; r. ME spere < OF."— Presentation transcript:
A round object, like a globe. In space, a planet, moon or star. Origin: 1250–1300; < LL sphēra, L sphaera globe < Gk sphaîra ball; r. ME spere < OF spere < LL spēra, var. of sphēra
The line around which a body, or planet, rotates Origin: 1540–50; < L axis an axletree, axle, axis.
In space, an orbit that is not flat but an elongated circle. Origin: 1745–55; < F < L ellīpsis ellipsis; or by back formation from the pl. ellipsesellipsis
The two times a year (December and June) when the Earth’s axis points most towards or away from the sun. Longest and shortest days. Origin: 1200–50; < ME < OF < L sōlstitium, equiv. to sōl sun + -stit-, comb. form of stat-, var. s. of sistere to make stand ( see stand) + -ium - ium; see -ice)stand- ium-ice
The step in the journey around the Earth that the moon takes; can be seen in 8 phases with different amounts of light and dark Origin: 1805–15; (n.) back formation from phases
In science, when the moon is growing brighter from right to left. Wax “on” Origin: bef. 900; ME waxen, OE weaxan; c. G wachsen; akin to waistwaist —Synonyms 1. extend, grow, lengthen, enlarge, dilate.
In science, when the surface of the moon is growing darker from right to left. Origin: bef. 900; ME wanen (v.), OE wanian to lessen; c. MD, MHG wanen, ON vana to cause to wane, destroy
When the moon is in the phase where the side facing the Earth is completely dark, no illumination.
The phase in the lunar cycle wherein the right half of the moon is illuminated Origin: 1250–1300; (n.) ME < AF; OF quartier < L quartārius, equiv. to quart ( us ) fourth + - ārius -ary; (v.) ME quarteren, deriv. of the n.fourth-ary
The phase of the moon when the left half is illuminated, opposite sides from 1 st quarter
When the moon blocks light from the Sun from landing on the Earth Origin: 1400–50; late ME < L sōlāris, equiv. to sōl sun + -āris -ar 1 sun-ar
Dark spots on the surface of the moon Caused by asteroids hitting the surface hard enough that lava seeped up and filled in the surface Origin: 1680–90; < L: sea
Twice a year (March and September) when the Earth’s axis is halfway between the two extreme points, creating 12 hours of light and 12 hours of dark equinox late 14c., from O.Fr. equinoxe, from M.L. equinoxium "equality of night (and day)," from L. aequinoctium, from aequus "equal" + nox (gen. noctis ) "night." The O.E. translation was efnniht. Related: Equinoctial
One body going around another body Moon revolves around Earth Earth revolves around Sun revolution late 14c., originally of celestial bodies, from O.Fr. revolution, from L.L. revolutionem (nom. revolutio ) "a revolving," from L. revolutus, pp. of revolvere "turn, roll back"