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31 meters – wavelength of the broadcast radio shortwave band at 9.7 MHz; 32 meters – length of one arcsecond of latitude on the surface of the Earth; 33.3 meters – height of the De Noord, the tallest windmill in the world; 34 meters – height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia
The poles also migrate a few meters across Earth's surface. This polar motion has multiple, cyclical components, which collectively are termed quasiperiodic motion . In addition to an annual component to this motion, there is a 14-month cycle called the Chandler wobble .
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).
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).
The biggest dry land area below sea level that has been known to exist during the geological past, as measured by continuous volume of atmospheric air below sea level, was the dry bed of the Mediterranean Sea of the late Miocene period during the Messinian salinity crisis.
Air density is a property used in many branches of science, engineering, and industry, including aeronautics; [2] [3] [4] gravimetric analysis; [5] the air-conditioning industry; [6] atmospheric research and meteorology; [7] [8] [9] agricultural engineering (modeling and tracking of Soil-Vegetation-Atmosphere-Transfer (SVAT) models); [10] [11 ...
The magnitude of the effect depends on the air density (and hence air pressure) or the water density respectively; see Apparent weight for details. The gravitational effects of the Moon and the Sun (also the cause of the tides ) have a very small effect on the apparent strength of Earth's gravity, depending on their relative positions; typical ...
The Sidoarjo mud flow (commonly known as Lumpur Lapindo, wherein lumpur is the Indonesian word for mud; and as Lusi (Lumpur Sidoarjo)) is the result of an erupting mud volcano [1] in the subdistrict of Porong, Sidoarjo in East Java, Indonesia that has been in eruption since May 2006.