On this day in 1797 - January 4th - German astronomer Wilhelm Beer was born.
Beer was an amateur astronomer, who with Johannes Heinrich MÃ¤dler, published the first map of the Moon (Mappa Salenographica). They also made a map of Mars and calculated the planet's rotation period to within 0.1 second of today's figure.
We take forum safety very seriously here at BellaOnline. Please be sure to read through our Forum Guidelines. Let us know if you have any questions or comments!