Fixed earth sun distance

[depion]

• [x] Closes #97
• [x] Tests added
• [x] Tests passed
• [x] Passes flake8 pyorbital
• [x] Fully documented

[codecov[bot]]

Codecov Report

Merging #99 (b59b389) into main (26e857b) will increase coverage by 0.17%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   86.86%   87.03%   +0.17%     
==========================================
  Files          13       13              
  Lines        2048     2052       +4     
==========================================
+ Hits         1779     1786       +7     
+ Misses        269      266       -3     

Flag	Coverage Δ
unittests	87.03% <100.00%> (+0.17%)	:arrow_up:

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Impacted Files	Coverage Δ
pyorbital/astronomy.py	92.75% <100.00%> (+4.18%)	:arrow_up:
pyorbital/tests/test_astronomy.py	86.66% <100.00%> (+2.66%)	:arrow_up:

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[mraspaud]

Thanks for your PR @depion, could you add a small test to ensure this doesn't break in the future?