id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_3lfxdqrjqbcffk5deirop3j3mq	James J Tattersall	Thomas Jefferson and Douwes' method for determining latitude	1987	7	.pdf	application/pdf	2884	192	62	Thomas Jefferson and Douwes' Method for Determining Key words: Jefferson, Douwes, Douwes' method, latitude determination. science and mathematics and gave Jefferson a good foundation in Latin, Greek, method of calculating latitude using double solar altitudes. The first zone contains data relating to five solar altitude observations taken on February 7, 1811. be given as a fu-st approximation to the true latitude (Jefferson used 37"42'), but To those who are unfamiliar with Douwes' method and the mathematics involved, the following illustration is offered as a key to understanding the computations that Jefferson dealt with in calculating the latitude of Poplar Forest. reference to the first solar altitude reading taken on February 7, Jefferson subtracted the sine of the lesser altitude (0.39450) from the sine of the greater altitude In "Trigonometry Problems," we are afforded a rare glimpse of Thomas Jefferson doing practical mathematics. The author thanks the University of Virginia Library for permission to reproduce Jefferson's "Trigonometry Problems." Thomas Jefferson and mathematics.	./cache/work_3lfxdqrjqbcffk5deirop3j3mq.pdf	./txt/work_3lfxdqrjqbcffk5deirop3j3mq.txt