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The gigametre (SI symbol: Gm) is a unit of length in the metric system equal to 1 000 000 000 meters (10 9 m). To help compare different distances this section lists lengths starting at 10 9 meters (1 gigameter (Gm) or 1 billion meters). 1.2 Gm – separation between Saturn and Titan; 1.39 Gm – diameter of Sun [168] [169]
The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
They arrived at a figure for the solar parallax of 9.5″, equivalent to an Earth–Sun distance of about 22 000 Earth radii. They were also the first astronomers to have access to an accurate and reliable value for the radius of Earth, which had been measured by their colleague Jean Picard in 1669 as 3 269 000 toises .
Simple meters are those whose upper number is 2, 3, or 4, sometimes described as duple meter, triple meter, and quadruple meter respectively. In compound meter , the note values specified by the bottom number are grouped into threes, and the upper number is a multiple of 3, such as 6, 9, or 12.
There are 14 mountains over 8,000 metres (26,247 ft), which are often referred to as the Eight-thousanders. (Some people have claimed there are six more 8,000m peaks in Nepal, making for a total of 20. [1])
The lambert (L) is a unit of luminance equal to 10 4 /π cd⋅m −2. The lumerg is a unit of luminous energy equal to 10 −7 lumen-seconds (100 nlm s). The talbot (T) is a unit of luminous energy equal to one lumen-second ( 1 lm⋅s ).
3C 273, optically the brightest quasar, of apparent magnitude 12.9, just dimmer than R136a1. 3C 273 is about 2.4 billion light-years away. 4.57 × 10 10 ly The comoving distance from the Earth to the edge of the visible universe is about 45.7 billion light-years in any direction; this is the comoving radius of the observable universe .
~187.4 m 2 ~224.1 sq yd tomna: tomniet, or tmien 1 ~1,124 m 2 ~1344 sq yd exactly 5 ⁄ 18 acre, or 12,100 square feet. This unit is also exactly 256 qasba kwadru. Sometimes called a tumolo in English texts. Also called Tumoli with modern real estate agents Cf. dunam. wejba: wejbiet 4 ~4497 m 2 ~1.111 acres exactly 1 + 1 ⁄ 9 acres. modd ...