Astronomy and related astronomical terms
(the science of the celestial bodies: the sun, the moon, and the planets; the stars and galaxies; and all of the other objects in the universe)
As he raised his cup,
"Thank heavens my business
Is looking up."
The classical orbital elements include the semi-major axis, eccentricity, inclination, argument of perigee, right ascension of ascending node, mean anomaly, and epoch time.
In Greek mythology, a giant and hunter, the son of the sea god Poseidon, who was killed by the goddess Artemis and then transformed into a constellation near the celestial equator containing the Great Nebula and more than 200 stars visible to the naked eye.
The parabolic shape is also used in telescope mirrors and radio telescope aerials to bring all the radiation gathered from an object into a sharp focus.
In astronomy, nearby stars show a shift owing to a parallax when seen from different locations on the Earth's orbit around the Sun. A star's parallax is used to determine its distance from the Earth.
Nearer bodies, such as, the Moon, Sun, and planets also show a parallax caused by the motion of the Earth.
One parsec is equal to 3.2616 light-years, 2.063 x 105 astronomical units, and 3.086 x 1013 kilometers.
An observer within the penumbral region will see a partial eclipse. It is also the name given to the outer dark region of a sunspot.
2. One of the varying shapes of the lighted portion of the Moon: In her book, Susan read that there were many phases of the Moon, like the Full Moon, Half Moon, and the Waning Crescent, among others.
They are nearly all based on highly sensitive, light-detecting electron tubes, called "photomultipliers".
In these devices, weak starlight causes electrons to be emitted from the surface of a photocathode, and each electron released can be made to produce many millions of secondary electrons.
The photosphere is the layer of the Sun that corresponds to the solar surface viewed in white light or the region from which light escapes from the Sun into space.
The photosphere is often marked by large, dark patches called "sunspots" and "faculae". The faculae are groups of small shining spots on the surface of the Sun which are brighter than the other parts of the photosphere.
About 300 kilometers, or 200 miles deep, the photosphere consist of incandescent gas at a temperature of 5,800 Kelvin (5,530° Celsius or 9,980° Fahrenheit).
Kelvin is the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites.
Rising cells of hot gas produce a mottling of the photosphere known as granulation and each granule is about 1,000 kilometers or 620 miles in diameter.
Also check out the Index of other Scientific and Technological Topics.