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Earth Sun Solar System Moon – Astronomy

In this lesson we discuss Earth Sun Solar System Moon – Astronomy.


a planet or star; heavenly body; a solid geometric figure generated by the revolution of a semicircle about its diameter; a round body whose surface is at all points equidistant from the center.


an imaginary line about which a body rotates.


the movement or path of the earth or a heavenly body turning on its axis.


the movement of one object around a central or another object


an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination


either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or about December 22, when it reaches its southernmost point.

Moon Phase

When the earth blocks the sun so the moon is a different shape

New Moon

The moon is between the Sun and Earth. You can’t see the lighted half of the Moon.

Waxing moon

the moon at any time after new moon and before full moon

Full Moon

When the whole moon is visible


the moon at any time after full moon and before new moon

Solar Eclipse

an eclipse in which the sun is obscured by the moon.

Lunar Eclipse

an eclipse in which the moon appears darkened as it passes into the earth’s shadow

Solar Noon

when the sun crosses the meridian and is at its highest elevation in the sky, at 12 o’clock apparent solar time.


Dark, flat, low-lying regions on the Moon’s surface

Impact basin

an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body with the surface.

Solar System

Solar System: the sun together with all the planets and other bodies that revolve around it.


the smallest and innermost planet in the Solar System


The second planet from the sun, Venus is terribly hot, even hotter than Mercury. The atmosphere is toxic


The third planet from the sun, Earth is a waterworld, with two-thirds of the planet covered by ocean. It’s the only world known to harbor life


The fourth planet from the sun, is a cold, dusty place


The fifth planet from the sun, Jupiter is huge and is the most massive planet in our solar system.

Great Red Spot

a giant storm which has raged for hundreds of years on Jupiter


the second-largest major planet, sixth from the sun.


The seventh planet from the sun, Uranus is an oddball. It’s the only giant planet whose equator is nearly at right angles to its orbit — it basically orbits on its side


The eighth planet from the sun, Neptune is known for strong winds — sometimes faster than the speed of sound.


Once the ninth planet from the sun. It is smaller than Earth’s moon.Now considered a dwarf planet.


a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun.


a transient fiery streak in the sky produced by a meteoroid passing through the earth’s atmosphere


a mass of stone or metal that has reached the earth from outer space; a fallen meteoroid.


any of the thousands of smallbodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those of Mars and Jupiter.


the angular distance north or south from the equator of a point on the earth’s surface.


angular distance east or west on the earth’s surface


the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.