A bonus southern sky
Canopus, the second-brightest star in the night sky and known in India as Agastya, climbs about 29° above the southern horizon from Thiruvananthapuram on winter evenings.
The Southern Cross rises just above the southern horizon on evenings from roughly February to June. You'll need a clear view over the sea or an open field, and the further south you are, the higher it gets.
Polaris hugs the horizon
The Pole Star (Dhruva) sits only as high as your latitude, so it's about 8° up in Thiruvananthapuram and about 12° in Kasaragod. Look for it low in the north. Saptarishi, the Big Dipper, swings above and below it through the night and is easiest to see in spring.
When to go out
The clearest skies come between November and March, after the north-east monsoon fades. April and May are hazy but often calm. During the south-west monsoon, from June to September, clear gaps are rare, so check the cloud forecast above before you travel.
Plan around the Moon too. Around the new moon (അമാവാസി) the sky is darkest; around the full moon (പൗർണ്ണമി) only the brightest objects stand out.
Find the W in the north
On autumn and winter evenings, look low in the north for five stars zig-zagging into a perfect W. That's Cassiopeia, and from Kerala it sits about 35° to 40° up at its highest. It points the way to Polaris, so it is a handy pole-finder too. Fun fact: it is also the sky's signature for the person who built this page.
Getting a darker sky
Light pollution is heavy around Kochi, Thiruvananthapuram and Kozhikode. Use the map above to find darker land nearby, such as high, open places near Munnar, Ponmudi, Vagamon and Wayanad. Check road, weather and forest-access rules before a night trip, and go with company.
Give your eyes 20 minutes to adjust, use a red torch, carry insect repellent, and watch your step on grass and rocks. Priyadarsini Planetarium in Thiruvananthapuram is a good place to start if you're new to all this.