How do i determine the longitude and latitude of any place on a map?

Question

I'm looking to determine the longitude of a certain spot in the Southern Atlantic Ocean for a project i'm currently doing, and I was wondering if there is any website which might tell me. Or, how do i figure it out myself from my own map at home?

Answer 1

Longitude is long up and down
and latitude is like a ladder across like this---

Answer 2

Google Earth will give you lat and long.......otherwise you will have to find a chart that has a lat long scale on the side and measure it off.......Lat is written Degrees, Minutes ( up to 59) Seconds (up to 59) then N or S .as in St Thomas is 18 ( insert degree circle here, sorry don't have it available) 20' 34" N.....

some new fangled idea is also to write it as a decimal, so 30 ' (30 minutes) would also be .5; in my example above you could also write 18.35 ( degree circle) N.....but traditionalists would frown upon you......