caption death_date death_place birth_place image_size nationality field birth_date known_for image article_title name
richard a. proctor 12 september 1888 new york city chelsea , london 230px english astronomy 23 march 1837 popular writings about astronomy early maps of mars richard anthony proctor2.jpg richard a. proctor
 richard a. proctor
richard a. proctor

richard anthony proctor -lrb- 23 march 1837 -- 12 september 1888 -rrb- was an english astronomer .
he is best remembered for having produced one of the earliest maps of mars in 1867 from 27 drawings by the english observer william rutter dawes .
his map was later superseded by those of giovanni schiaparelli and eugène antoniadi and his nomenclature was dropped -lrb- for instance , his `` kaiser sea '' became syrtis major planum -rrb- .
he used old drawings of mars dating back to 1666 to try to determine the sidereal day of mars .
his final estimate , in 1873 , was 24h 37m 22.713 s , very close to the modern value of 24h 37m 22.663 s. nevertheless , frederik kaiser 's value of 24h 37m 22.622 s is closer , by 0.012 seconds in 88,642.688 seconds , a very small difference in the error of both computations .
a crater on mars is named after proctor .
