Near pole disturbance

[bartoszreszka]

Problem

• When drawing charts for latitudes beyond arctic circle in autumn, when sun ceases to rise, program generates ugly artifacts:

• Similar issue being generated for southern semisphere beyond 75 degree in this year's October.

Steps to reproduce

• Generate chart for location beyond 78 degree on October of 2021.

Expected

• [ ] Valid polygon.

[bartoszreszka]

• [ ] Generate test chart for φ = 54.00° λ = 083.00°

Note the -1:-1 sunrise hour on 30th of June.

[bartoszreszka]

22 fixes polygon for most use cases