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  1. Definition of astronomical as in enormous unusually large a googol is an astronomical number, and the whimsical coinage of the name was intended to suggest that fact Synonyms & Similar Words Relevance enormous immense oceanic planetary cosmic galactic prodigious monumental massive tremendous huge gigantic colossal gargantuan titanic vast oversize

  2. Jan 5, 2023 · Astronomical distance measurement began with a knowledge of Earth’s diameter, which provided a base for triangulation. Within the inner solar system, some distances can now be better determined through the timing of radar reflections or, in the case of the Moon, through laser ranging. For the outer planets, triangulation is still used.

  3. as•tro•nom•i•cal (ˌæs trəˈnɒm ɪ kəl) also as`tro•nom′ic, adj. 1. of, pertaining to, or connected with astronomy. 2. extremely large; enormous: astronomical costs. [1550–60; < Latin astronomic (us) (< Greek astronomikós; see astronomy, -ic) + -al 1] as`tro•nom′i•cal•ly, adv.

  4. Astronomical Events in 2023 Jan 3/4: Quadrantids Meteors 3 Jan. The first major meteor shower of 2022, the Quadrantids, peaks on the night of January 3 and early morning hours of January 4. What is a meteor shower? Jan 4: Earth's Perihelion 4 Jan. At 16:17 UTC, the Earth will reach its perihelion—the point on its orbit closest to the Sun.

  5. The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out various astronomical calculations. For example, stating that the planet Jupiter is 5.2 AU (5.2 Earth distances) from the Sun and that Pluto is nearly 40 AU gives ready comparisons of the distances of all three bodies.

  6. Jan 27, 2023 · Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes ...

  7. Astronomical Twilight, Dawn, and Dusk. Astronomical twilight occurs when the Sun is between 12 degrees and 18 degrees below the horizon. Astronomical dawn is the time when the center of the Sun is at 18 degrees below the horizon. Astronomical dusk is the instant when the center of the Sun is at 18 degrees below the horizon.

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