The gemara discusses all sorts of blessings that one says, for example, on seeing many Jewish people at once, a king, a smart person, even if they are not Jewish. The gemara tells a story of Rav Sheshet who was blind and was still able to tell when the king was coming and made a blessing, even though he  couldn't see him. There are blessings for one who sees Jewish people and idol worshippers living in their settlements, and also seeing them destroyed, burial places of Jews and idol worshippers, one who sees a friend after 30 days or a year, one who sees strange looking people or animals. What is the word "zikin" mentioned in the mishna? The gemara starts a discussion of the constellations.