The clock takes into consideration • the number of waking hours in a day, • preferring long blocks of time for working on things, and • standard time being better than daylight time.

This clock is aimed at 15 waking hours in a day spread out over five three-hour periods with the beginning and end each roughly as close to sunrise and sunset respectively as possible and the half-way point being close to solar noon.

•   1% of 3 hours = 108 seconds
•   5% of 3 hours = 9 minutes
• 20% of 3 hours = 36 minutes
• 25% of 3 hours = 45 minutes
• 33% of 3 hours = 1 hour
• 50% of 3 hours = 1.5 hours

Dark Mode

Weather page excerpt with Clear Sky Chart (formerly known as a Clear Sky Clock):

60 60 60 59 58 57 57 57 56 57 57 57 57 58 58 59 60 63 69 73 77 80 82 83

Currently: 73°F  — — Heavens-Above

73 70 68 66 64 63 62 61 61 60 60 61 63 65 68 69 71 73 74 75 75 75 74 72 69 68 67 65 64 63 62 61 60 60 60 60 60 61 61 62 62 63 63 63 64 64 64 63