RT @Astroguyz: #Bornonthisday 1564-David Fabricius en.wikipedia.org/wiki/David_Fab… Discovered the variability of Mira & made early sunspot observati…
RT @Astroguyz: #Bornonthisday 1564-David Fabricius en.wikipedia.org/wiki/David_Fab… Discovered the variability of Mira & made early sunspot observati…