Satellites visible from Tirunelveli (8.7139°N, 77.7567°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.
Tirunelveli lies on the Thamirabarani about 558 km south-west of Chennai, with the Western Ghats rising to the west. ISRO's Propulsion Complex at Mahendragiri, in the same district, test-fires the engines that power India's rockets.
In the rain shadow of the Ghats, Tirunelveli waits for the north-east monsoon between October and December. February to May are dry and mostly clear.
Kalakkad Mundanthurai Tiger Reserve, in the hills to the west, is dense forest with no lights.
Pass times for Thoothukudi, Kanyakumari.
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.