| burn |
of a person or a person's skin, to be overexposed to the sun. [1/14 definitions] |
| circumsolar |
revolving around or surrounding the sun. |
| comet |
a heavenly body orbiting the sun and having a nucleus surrounded by a nebulous sheath that may form an elongated tail when the body comes close to the sun. |
| Copernican system |
the theory, first held by Copernicus, that the earth and other planets revolve around the sun. |
| dog days |
the hot, humid days of July and August, when the Dog Star, Sirius, rises and sets with the sun. |
| east |
the direction in front of a person facing the rising sun. [1/7 definitions] |
| exoplanet |
a planet that orbits a star that is not our sun. |
| facula |
any of several large irregular bright spots or streaks visible on the surface of the sun. |
| helio- |
sun. |
| ionosphere |
layers of the earth's atmosphere located above the stratosphere from about thirty to two hundred and fifty miles above the earth's surface, and composed of rarefied gases that have been ionized by radiation from the sun. |
| last quarter |
the moment, one week after a full moon, when half the moon is illuminated by the sun. [1/2 definitions] |
| lunar eclipse |
the obscuring of the moon's reflected light by the earth's shadow when the earth passes between the moon and the sun. |
| lunisolar |
involving the combined gravitational force of the moon and sun. |
| moon |
the earth's natural satellite, revolving completely around the earth from east to west in about twenty-eight days and accompanying the earth in its orbit around the sun. [1/6 definitions] |
| north |
the direction to the left of a person facing the rising sun. [1/6 definitions] |
| parasol |
a light umbrella used esp. by women as protection against the sun. |
| perihelion |
the point in the orbit of a planet or other body at which it comes closest to the sun. (Cf. aphelion.) |
| photosphere |
the shining, visible surface of a star, esp. the sun. |
| retrograde |
in astronomy, moving in a direction opposite to that of the movement of the earth around the sun. [1/4 definitions] |
| solar |
of, relating to, or derived from the sun. [2/4 definitions] |
| solar energy |
radiant energy from the sun or any form of energy that is produced using radiant energy from the sun. |