One weird trick to know when the next moon phase will happen

All you need is to know the current phase, a time-synced clock (most modern OSes do that) and a chart of when the phases happen relative to new moon.

Code:

+00:00 New Moon         Blood River
+08:45 Waxing Crescent  Solace Bridge
+17:30 First Quarter    Highvale
+26:15 Waxing Gibbous   Brookside
+35:00 Full Moon        Owl's Head
+43:45 Waning Gibbous   Westend
+52:30 Third Quarter    Brittany Graveyard
+61:15 Waning Crescent  Etceter
+70:00

The weird trick is that because the entire lunar cycle is a multiple of ten minutes, the seconds and ones of minutes will always be the same!*

So if the current phase is Full Moon, and the current time is :48:00 into the hour, that means the current phase started at :45:00 into the hour, and the next phase will be at :53:45 into the hour, so the next phase (to Westend) happens in just over five minutes, and the next next one (to Brittany Graveyard) just under 9 minutes after that at :02:30. So print the chart and tape it to your monitor.

*Note that this chart only works for full-hour time zones. If you live in a half-hour time zone, you will need to make a different table.

 

Paging @Bowen Bloodgood

 

*poof* so as I wa... huh? What? Oh.. astronomy math stuff.. yeah looks good..