RT @hist_astro: Happy #birthday to American astronomer Maria Mitchell, b. OTD 1818 shar.es/1tntOw via @ShareThis http://t.co/0j7r2ozymt
RT @hist_astro: Happy #birthday to American astronomer Maria Mitchell, b. OTD 1818 shar.es/1tntOw via @ShareThis http://t.co/0j7r2ozymt