| Bibliographic Entry | Result (w/surrounding text) | Standardized Result |
|---|---|---|
| Hess, Frances. Earth Science. New York: Glencoe Mc Graw-Hill, 2002: 348. | "The Sun's orbit around the galaxy is about 220 km/s and thus its orbital period is about 240 million years." | 240 million years |
| Morris, Mark. "The Milky Way." The World Book Encyclopedia, 2002, Vol. 13: 551. | "The Sun's completes an almost circular orbit of the center (of the galaxy) about every 250 million years." | 250 million years |
| Croswell, Ken. The Alchemy of the Heavens Searching for the meaning of the Milky Way. New York: Doubleday, 1995: 2. | "The Galaxy is so huge that the Sun requires 230 million years to complete one orbit around the Milky Way's center." | 230 million years |
| Moore, Patrick. The International Encyclopedia of Astronomy. New York: Mitchell Beazly Publishers, 1981: 45. | "Cosmic Year: the time taken for one complete revolution of the Sun around the entire center of the galaxy; about 225 million years." | 225 million years |
| Kerrod, Robin. Encyclopedia of Science Heavens 2. New York: MacMillian Reference USA, 1997: 35. | "The Sun takes 225 million Earth years to make one rotation. This period of time is called a cosmic year." | 225 million years |
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