ButterflyDiagrams of the Sun
http://home.tiscali.nl/~slooten/The plotting of sunspots with a computer.
Submitted in section: Astronomy: Amateur: Solar System Observing: Sun: ButterflyDiagrams of the Sun
The plotting of sunspots with a computer.
Submitted in section: Astronomy: Amateur: Solar System Observing: Sun: ButterflyDiagrams of the Sun