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Earth radius (denoted as R 🜨 or R E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).
Posidonius calculated the Earth's circumference by reference to the position of the star Canopus.As explained by Cleomedes, Posidonius observed Canopus on but never above the horizon at Rhodes, while at Alexandria he saw it ascend as far as 7 + 1 ⁄ 2 degrees above the horizon (the meridian arc between the latitude of the two locales is actually 5 degrees 14 minutes).
Knowledge of the location of Earth has been shaped by 400 years of telescopic observations, and has expanded radically since the start of the 20th century. Initially, Earth was believed to be the center of the Universe, which consisted only of those planets visible with the naked eye and an outlying sphere of fixed stars. [1]
Yields: 4-6 servings. Prep Time: 10 mins. Total Time: 4 hours 30 mins. Ingredients. 1 1/2 lb. sirloin steak, thinly sliced. 1 c. low-sodium beef broth. 1/2 c.
One’s biological age, which measures the body’s physiological state, may help predict who is at risk for developing colon polyps, a known risk factor for colorectal cancer.
The astronomical unit (symbol: au [1] [2] [3] [4] or AU) is a unit of length defined to be exactly equal to 149 597 870 700 m. [5] Historically, the astronomical unit ...
Fires continue to burn for a second week in the Los Angeles area, killing at least 27 people, destroying more than 12,000 structures and prompting evacuation orders for as many as 200,000 ...
Earth is the third planet from the Sun and the only astronomical object known to harbor life.This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water.