@Suuper: True enough. True too that if your planet rotates and orbits in a similar fashion to ours, then the shortest and longest days of the year will repeat with the same regularity.
@NO1SY: As a coda to your comment on receiving critique, I will add that is also important (although probably less so) to develop a skill at identifying when someone isn't critiquing you, but attacking you. We've seen it here on MR before. Sometimes a member comes along who is satisfied with nothing, and sees only flaws wherever they look. One member I won't name in particular was infamous for bashing on stories they themselves did not actually read. I recall a comment they gave me which complained about me using the 1st person perspective, because they preferred 3rd person stories. This already was a worthless critique. Neither form of perspective is inherently better or worse, just different. That is already grounds for dismissal of a comment. But what peeved me the most was that my story was written in 3rd person, so by their own comment did they betray the fact they didn't do the reading.
So yeah, develop a keen sense for not only trolls, but for lazy reading.