Satellites visible from Gangtok (27.3389°N, 88.6065°E) tonight, with the IST start time, direction, peak height and brightness of each pass. A pass is listed only when the satellite clears 10°, is sunlit, your sky is dark and it reaches about magnitude 4.5.
Gangtok, the capital of Sikkim, spreads across a ridge at about 1,650 m, with Kanchenjunga, the world's third-highest peak, visible to the north-west on clear mornings. The town's lights stack up the slopes, but the valleys around it are deep and dark.
The monsoon is long and heavy here, lasting from May to September. October and November, and the cold, dry weeks of winter, bring the clearest mountain skies.
Tsomgo Lake, about 40 km north-east at around 3,750 m, lies above the cloud on many winter nights.
Pass times for Darjeeling, Siliguri.
The ISS is the brightest at magnitude -3 to -4, followed by China's Tiangong station, large Earth-observation satellites, spent rocket bodies and Starlink trains in the days after a launch. GPS and NavIC satellites orbit too high to see with the naked eye.