A sexagesimal degree is one ninetieth of a right angle (90º). In turn, a sexagesimal degree can be divided into 60 sexagesimal minutes and each of these, in turn, into 60 sexagesimal seconds.
In this way we could have the following sexagesimal notation:
13°30′238″
If we are composing a page HTML we will have to know how to treat the minute and sexagesimal second symbols.
The symbols used to represent them are the prime (‘) for the sexagesimal minute and the double prime (») for the second sexagesimal. To perform this representation, the language HTML has two entities ′ for the premium and ″ for the double premium. You have to be careful, since only the capital P differentiates them.
Remember that entities go between an ampersand (&) and a semicolon (;).
In this way, if we want to represent the previous sexagesimal value, we would have the following code HTML.
23º27′30″
You can read more about the sexagesimal degree in the WIKI.