We are currently calculating our own astronomical data while the USNO is out of service. Please sanity check the times you get and report problems on our GitHub page.

Trouble keeping your sunsets straight from your civil twilights? Can't remember when your TOMATOFLAMES require FLAPS? Find USNO astronomical tables confusing? We've got your back.

Plug in your airport ID, and optionally a date, below and we'll tell you what the Federal Aviation Regulations say about what you need to fly and what you can log.