Geocentric & Topocentric coordinates

本來今天晚上要用我的西藏天文台學習觀測一個Varuna小行星(Kulper Belt Object)的掩星現象,填補一下我所屬區域的空白,最後受天文台一些技術因素影響而未能進行,但這幾天也同時遇到一個對我來說陌生的名詞 : Topocentric coordinate
A system of celestial coordinates with its origin at a specific point on Earth's surface. Usually, the difference in the position of an object in the sky measured using topocentric and geocentric (Earth-centered) coordinates is very small because most celestial objects are so far away. The Moon's position, however, can vary as much as 2° depending on where on Earth it is measured from, and, within the past few years, an observatory in Australia missed spotting an asteroid that passed close to Earth because it used geocentric rather than topocentric positions.
有個說法,戰爭時期的科研發展是最快的。而在和平時代,一個業餘愛好者成長最快的方法,就是在高晴天率的星空下,建立一個私人遙控天文台,然後去找些不同的活來幹 :mrgreen:
A system of celestial coordinates with its origin at a specific point on Earth's surface. Usually, the difference in the position of an object in the sky measured using topocentric and geocentric (Earth-centered) coordinates is very small because most celestial objects are so far away. The Moon's position, however, can vary as much as 2° depending on where on Earth it is measured from, and, within the past few years, an observatory in Australia missed spotting an asteroid that passed close to Earth because it used geocentric rather than topocentric positions.
有個說法,戰爭時期的科研發展是最快的。而在和平時代,一個業餘愛好者成長最快的方法,就是在高晴天率的星空下,建立一個私人遙控天文台,然後去找些不同的活來幹 :mrgreen: