VOA慢速英语:Benjamin Banneker: Surveyor, Mathematician, Astronomer

accurate –adj. able to produce results that are correct

longitude –n. the distance measured by degrees from east to west around the globe

latitude –n. the distance measured in degrees north to south

ephemeris –n. an document that gives times, dates and position for astronomical objects in the sky like the sun, moon and planets

unalienable –adj. impossible to take away or give up

apprehensions –n. fear that something bad or unpleasant is going to happen, worries

brethren –n. a formal way to say brothers or to refer to fellow members of a church