Hack a Day’s very own [Jack Buffington] is throwing his hat into the ring for the Buildlounge laser cutter giveaway with his solar clock that isn’t a sundial. The theory behind [Jack]’s ...

Your watch or clock measures standard time. Your sundial records solar time, which is not the same. According to solar time, noon is when the sun is directly overhead. Even though noon in Boston ...

Sundial time is the true solar time at our location equal to the hour angle of the Sun (plus 12 hours since LAST begins at midnight rather than noontime). From your adjustment for Mean Solar Time, ...

The horizontal lines measured the length of the shadow of the gnomon. The 13 horizontal lines read the 24 julgi, solar terms. There were only 13 to represent the 24 solar terms since the length of the ...