今晚有哪些衛星飛過你頭頂？

今晚如何觀賞衛星

衛星最容易在日落後不久或日出前看到：此時你頭頂的天空已經變暗，而數百公里高的衛星仍被陽光照亮。它們看起來像穩定不閃爍的光點，幾分鐘內劃過天空。

選擇你的位置，SkyPass Tonight 會列出今晚每一次預測過境：何時出現、往哪個方向看、升到多高、何時消失。仰角超過 40° 的過境最容易看到。

常見問題

為什麼衛星會突然消失？

它進入了地球的陰影。衛星仍在軌道上，只是不再反射陽光。

時間有多準？

通常誤差在一分鐘以內。軌道每天都會略有變化，因此網站每次重新建置時都會更新軌道資料。

需要望遠鏡嗎？

不需要。國際太空站、天宮和星鏈列車用肉眼就能看到；較暗的衛星用雙筒望遠鏡更容易看清。

關於與致謝

SkyPass Tonight 使用 SGP4 軌道模型（satellite.js）在你的瀏覽器中計算每次過境。無需帳號，不做追蹤。

• 軌道資料: CelesTrak (GP element sets)
• 地圖: © OpenStreetMap contributors, Leaflet
• 地點搜尋: Photon (komoot), OpenStreetMap data, ODbL
• 時區: @photostructure/tz-lookup
• SGP4: satellite.js (MIT)
• 照片: NASA — S134-E-010137, S125-E-011846. NASA 圖片屬於公有領域；NASA 並未為本站背書。
• 原始碼: 部分程式碼改編自 dev-Armaan/satellites，依 MIT 授權條款： github.com/dev-Armaan/satellites

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