將千米轉換為地球極半徑
千米
定義: A kilometer (symbol: km) is a unit of length in the International System of Units (SI). One kilometer is equivalent to 0.6214 miles.
歷史/起源: The prefix kilo- is a metric prefix indicating one thousand. One kilometer is therefore one thousand meters. The origin of the kilometer is linked to that of the meter, and its current definition as the distance traveled by light in 1/299 792 458 second. This definition is subject to change, but the relationship between the meter and the kilometer will remain constant.
目前用途: It is currently the official unit of measurement for expressing distances between geographical places on land in most of the world. However, there still remain a number of countries that primarily use the mile instead of the kilometer including the United States and the United Kingdom (UK). Unlike the United States, the UK has adopted the metric system; while the metric system is widely used in government, commerce, and industry, remnants of the imperial system can still be seen in the UK's use of miles in its road systems.
地球極半徑
定義:
千米轉地球極半徑對照表
| 千米 [km] | 地球極半徑 [Earth's polar radius] |
|---|---|
| 0.01 km | 0.000002 Earth's polar radius |
| 0.10 km | 0.000016 Earth's polar radius |
| 1 km | 0.000157 Earth's polar radius |
| 2 km | 0.000315 Earth's polar radius |
| 3 km | 0.000472 Earth's polar radius |
| 5 km | 0.000787 Earth's polar radius |
| 10 km | 0.001573 Earth's polar radius |
| 20 km | 0.003146 Earth's polar radius |
| 50 km | 0.007866 Earth's polar radius |
| 100 km | 0.0157 Earth's polar radius |
| 1000 km | 0.1573 Earth's polar radius |
如何將千米轉換為地球極半徑
1 km = 0.000157 Earth's polar radius
1 Earth's polar radius = 6357 km
範例
Convert 15 km to Earth's polar radius:
15 km = 15 × 0.000157 Earth's polar radius = 0.002360 Earth's polar radius
