Which of the following is considered as the first surviving Indian text containing a systematic discussion of astronomical instruments?
Bramasphutasiddhanta
Brahmagupta’s Brahmasphutasiddhanta, composed in 628 CE, gives the first surviving extensive, systematic treatment of the construction and use of astronomical instruments in the Sanskrit astronomical tradition. Earlier works mention instruments, but this does not amount to the same systematic account.
Which of the following space agencies uses a spacecraft named Hayabusa ?
What is the radius of the moon?