Avoid using single char name

[azzamsa]

Hi, Abdelhak.

I plan to refactor my Rust port. Primarily the baselib.
I am having a hard time understanding the equation because of single variable names such:

• pyIslam/pyIslam/baselib.py

  Line 24 in eb5cd7a

  n = jd - 2451544.5

Are you able to rename those single-char names to a more descriptive name?

def equation_of_time(jd):
    '''Get equation of time'''
    n = jd - 2451544.5
    g = 357.528 + 0.9856003 * n
    c = 1.9148 * dsin(g) + 0.02 * dsin(2 * g) + 0.0003 * dsin(3 * g)
    lamda = 280.47 + 0.9856003 * n + c
    r = (-2.468 * dsin(2 * lamda)
         + 0.053 * dsin(4 * lamda)
         + 0.0014 * dsin(6 * lamda))
    return (c + r) * 4

jd would be julian_day, but I have no clue about n, g, c, etc.
Is the source also using a single char name?