Question

I am working on an application with Spatial data. Here I need to find the distance from the centroid to a point. Can know how to convert miles to degrees in Java?

Answer 1

Final Edit: Look into Great Circle Distance and Geodesics to discover the complexities of what you were really asking in this question. This is admittedly well out of my familiarity with mathematics.

[Leaving original suggestions in for historical reasons. Though pieces may help you, they will not directly answer your question.]

See https://stackoverflow.com/a/1253545/1964221 for the answer to this question.

Latitude: 1 deg = 110.54 km

Longitude: 1 deg = 111.320*cos(latitude) km

To go the other direction, I wonder if we can do this(my algebra is rusty):

Latitude: 1 km = 1 deg / 110.54 km
Longitude: 1 km = 1 deg / (111.320*cos(latitude) km)

Application

Is your distance always strictly East-West or North-South? If so, you should be able to say:

Integer latTraveledMiles = 100;
Double latTraveledKM = 100 * 0.621371;
Double latTraveledDeg = (1 / 110.54) * latTraveledKM;

or

Double currentLat = 74.0064;
Integer longTraveledMiles = 100;
Double longTraveledKM = 100 * 0.621371;
Double longTraveledDeg = (1 / (111.320 * Math.cos(currentLat))) * longTraveledKM;

More than likely, you will need to know distance in both North-South and East-West directions(and takes this into the realm of "not straight-forward). You could look at the Pythagorean Theorem. You know the "long side" of the triangle(c^2) and can calculate for longitude(a^2) and latitude(b^2).

You should be able to apply portions of my previous code snippets to figure out
c = sqrt(a^2 + b^2).

Good luck.