Add next and previous lunar phase methods

[danthareja]

This is super random, but I was looking for some code to find the date for the next full moon and came across your project.

Instead of re-inventing the wheel, I decided to fork your work and thought I'd submit a PR back.

[jasonsturges]

@danthareja Hi, appreciate this. My solution is always off by 2-hours, which I haven't had a chance to fully debug.

API is great, but I'm not sure this hits the exact hour and minute? Let me scope this out, and revisit why my solution was off.

[sbsmatt]

I'm also here for next phase, and next phase date.
That's usually the next thing people want to see after the current phase.

[danthareja]

@jasonsturges thanks for the review.

I did notice some interesting behavior when testing the timings of this latest full moon.

The current calculation is good enough for my very naive use at the moment, but I am curious to hear if the timings can be tightened up a bit.

[jasonsturges]

@danthareja Sorry, been through an epic saga of buying a home and moving. Sure you've probably incorporated something into your solution - hopefully this helped give you a start. Getting back into the swing of things and will pick this up.

[danthareja]

Totally understand man, real life should always take priority over free open source side projects.

I am still curious if you do figure out something here but absolutely no stress