CHENNAI: The Tamil Nadu Science and Technology Centre is organising a three-day ‘Winter School on Astronomy and Astrophysics’ workshop for class 7-9 students from December 29 to 31 between 10 am and 4 pm at Birla Planetarium. Fundamentals of the subject will be taught. The course also has practical observational sessions for deep sky objects, using modern telescopes. Only 50 students will be admitted and the entry is on first-come-first-serve basis. For registration, call 24410025.