by APOD Robot » Sat Dec 02, 2023 5:07 am
Startrails over Beijing Ancient Observatory
Explanation: You can take a subway ride to visit this observatory in Beijing, China but you won't find any telescopes there. Starting in the 1400s astronomers erected devices at the
Beijing Ancient Observatory site to enable them to accurately measure and track the positions of
naked-eye stars and planets. Some of the large, ornate
astronomical instruments are still standing. You can even see stars from the star observation platform today, but now only the very brightest celestial beacons are visible
against the city lights. In this time series of exposures from a camera fixed to a tripod to record graceful arcing startrails, the brightest trail is actually the Moon. Its broad arc is seen behind the ancient observatory's brass
armillary sphere. Compare this picture from the Beijing Ancient Observatory taken in September 2023 to
one taken in 1895.
[url=https://apod.nasa.gov/apod/ap231202.html] [img]https://apod.nasa.gov/apod/calendar/S_231202.jpg[/img] [size=150]Startrails over Beijing Ancient Observatory[/size][/url]
[b] Explanation: [/b] [url=https://asd.gsfc.nasa.gov/blueshift/index.php/2010/08/20/maggies-blog-beijings-ancient-observatory/]You can take[/url] a subway ride to visit this observatory in Beijing, China but you won't find any telescopes there. Starting in the 1400s astronomers erected devices at the [url=https://www.bjp.org.cn/en/Beijing%20Ancient%20Observatory/History%20of%20the%20Observatory/index.shtml]Beijing Ancient Observatory[/url] site to enable them to accurately measure and track the positions of [url=https://science.nasa.gov/skywatching/]naked-eye stars and planets[/url]. Some of the large, ornate [url=https://www.bjp.org.cn/en/Beijing%20Ancient%20Observatory/Astronomical%20instruments/list.shtml]astronomical instruments[/url] are still standing. You can even see stars from the star observation platform today, but now only the very brightest celestial beacons are visible [url=https://apod.nasa.gov/apod/ap110716.html]against the city lights[/url]. In this time series of exposures from a camera fixed to a tripod to record graceful arcing startrails, the brightest trail is actually the Moon. Its broad arc is seen behind the ancient observatory's brass [url=https://en.wikipedia.org/wiki/Armillary_sphere]armillary sphere[/url]. Compare this picture from the Beijing Ancient Observatory taken in September 2023 to [url=https://apod.nasa.gov/apod/ap980506.html]one taken in 1895[/url].
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