3 ms·
Yes but diffraction of light wasn't understood at the time, or until a couple centuries later.
by shadowprofile77 7y ago
Yes but diffraction of light wasn't understood at the time, or until a couple centuries later.
- anovikov 7y agoTycho was pre-telescope... so he had no idea that Saturn has a bigger visual diameter than Procyon... But, he could at least figure it out indirectly - by noticing that all stars twinkle a lot, while planets do not (or only a bit, on the worst nights).