How to Identify that Light in the Sky


What is that light in the sky? Perhaps one of humanity's more common questions, an answer may result from a few quick observations. For example -- is it moving or blinking? If so, and if you live near a city, the answer is typically an airplane, since planes are so numerous and so few stars and satellites are bright enough to be seen over the din of artificial city lights. If not, and if you live far from a city, that bright light is likely a planet such as Venus or Mars -- the former of which is constrained to appear near the horizon just before dawn or after dusk. Sometimes the low apparent motion of a distant airplane near the horizon makes it hard to tell from a bright planet, but even this can usually be discerned by the plane's motion over a few minutes. Still unsure? The featured chart gives a sometimes-humorous but mostly-accurate assessment. Dedicated sky enthusiasts will likely note -- and are encouraged to provide -- polite corrections. via NASA http://ift.tt/2xAZSQ5

댓글

이 블로그의 인기 게시물

iOS 아이폰용 앱 개발을 위한 디자인시, 디자이너가 참고 해볼만한 사항들

스냅드래곤 기반 크롬북, ‘트로그도어’ 개발 중

[펌] 구글 마켓에 있는 apk를 PC로 바로 다운받자