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He used trigonometry to calculate the radius of the Earth using measurements of the height of a hill and measurement of the dip in the horizon from the top of that hill. His calculated radius for the Earth of 3928.77 miles was 2% higher than the actual mean radius of 3847.80 miles. [ 19 ]
2 Second table: estimated average height of 19-year-olds in 2019. ... Below are two tables which report the average adult human height by country or geographical region.
Human height or stature is the distance from the bottom of the feet to the top of the head in a human body, standing erect. It is measured using a stadiometer, [ 1] in centimetres when using the metric system or SI system, [ 2][ 3] or feet and inches when using United States customary units or the imperial system. [ 4][ 5] In the early phase of ...
Demographics of the world. Demographics of Earth. Population pyramid of the world in 2022 by the UN. Population. Over 8,120,531,329 (estimated) Fertility rate. 2.27 (2021) Earth has a human population of over 8 billion as of 2024, with an overall population density of 50 people per km 2 (130 per sq. mile). Nearly 60% of the world's population ...
Ptolemy calculated that the Earth's angle of axial precession varied by one degree every 100 years. Ibn Yunus calculated the rate of change to be one degree every 70 1 ⁄ 4 years. [citation needed] Between 1025 and 1028, the polymath Ibn al-Haytham wrote his Al-Shukuk ala Batlamyus ("Doubts on Ptolemy").
The troposphere is the lowest layer of Earth's atmosphere. It extends from Earth's surface to an average height of about 12 km (7.5 mi; 39,000 ft), although this altitude varies from about 9 km (5.6 mi; 30,000 ft) at the geographic poles to 17 km (11 mi; 56,000 ft) at the Equator, [23] with some variation due
Shapiro has been a target of online harassment and antisemitic threats from the alt-right. After leaving Breitbart News, Shapiro was a frequent target of antisemitic rhetoric from the alt-right. [35] According to a 2016 analysis by the Anti-Defamation League, Shapiro was the most frequent target of antisemitic tweets against journalists. [94] [95]
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and azimuth . Therefore, the horizontal coordinate system is sometimes called the az/el system, [ 1] the alt/az system, or the alt-azimuth system, among ...