* Astronomy

China, India's largest trading partner, claims sovereignty over parts of Ladakh and Arunachal Pradesh and calls it southern Tibet. It refuses to recognise the "imperialist" 1913 Shimla Convention under which Tibet ceded Tawang to India and regards its border with India -- the McMahon line -- as disputed.
The two countries have sparred over high-profile visits to Arunachal Pradesh asserting India's sovereignty over the region while New Delhi recently expressed its displeasure over Beijing's infrastructural projects and overall presence in PoK. Beijing has been issuing stapled visas to Kashmiris as part of its refusal to accept India sovereignty over Jammu & Kashmir.
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