今晚有哪些卫星飞过你头顶？

今晚如何观看卫星

卫星最容易在日落后不久或日出前看到：此时你头顶的天空已经变暗，而几百公里高的卫星仍被阳光照亮。它们看起来像稳定不闪烁的光点，几分钟内划过天空。

选择你的位置，SkyPass Tonight 会列出今晚每一次预测过境：何时出现、往哪个方向看、升到多高、何时消失。仰角超过 40° 的过境最容易看到。

常见问题

为什么卫星会突然消失？

它进入了地球的阴影。卫星仍在轨道上，只是不再反射阳光。

时间有多准？

通常误差在一分钟以内。轨道每天都会略有变化，因此网站每次重新构建时都会更新轨道数据。

需要望远镜吗？

不需要。国际空间站、天宫和星链列车用肉眼就能看到；较暗的卫星用双筒望远镜更容易看清。

关于与致谢

SkyPass Tonight 使用 SGP4 轨道模型（satellite.js）在你的浏览器中计算每次过境。无需账号，不做跟踪。

• 轨道数据: CelesTrak (GP element sets)
• 地图: © OpenStreetMap contributors, Leaflet
• 地点搜索: Photon (komoot), OpenStreetMap data, ODbL
• 时区: @photostructure/tz-lookup
• SGP4: satellite.js (MIT)
• 照片: NASA — S134-E-010137, S125-E-011846. NASA 图片属于公有领域；NASA 并未为本站背书。
• 源代码: 部分代码改编自 dev-Armaan/satellites，遵循 MIT 许可证： github.com/dev-Armaan/satellites

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