Gauge for Length of Day (showing Solstices & Equinoxes)


#103

Happy Winter Solstice everyone!

Thanks to TWC’s seconds, my dials were more accurate this year than ever before…

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When I examine the code, today’s day length was actually 6 seconds off from my actual location. I cannot blame my math… I cannot blame webCoRE… It is simply TWC reports the sunrise and sunset for a station a few miles away.


If anyone else wants to calibrate THEIR piston, I recommend running these two expressions today… right now… before midnight hits

$twcweather.conditions.sunriseTimeLocal
$twcweather.conditions.sunsetTimeLocal

Save the results to a text file, then later on, when you are bored, you can do the math to find the shortest day that TWC sees for your location.


#104

Wow… Sometimes I am really impressed with my math…

Earlier this year, I estimated that using TWC for sunrise & sunset times will bring the results within 0.007% of accuracy…

The results for this year are in…

This Winter Solstice returned 0.042%… (instead of 0%)
(Which is exactly 6 seconds off, due to my location)
and of course…
0.007 x 6 = 0.042

The math could not be any more perfect!!
(not that anyone else cares, LOL)


#105

First full day of Winter, and the new colors switched over on schedule…

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The next six months, the dial will be moving towards the right…


#106

… and so ends the three month period with the least amount of sunlight… (“Darkember”?)

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#107

We are exactly three weeks away from the Spring Equinox
(on the right gauge, it will be straight up at 50%)

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For the observant folks, the right dial moves the fastest over the next six weeks…
(meaning the largest increases in daylight day-to-day)


Interesting side note:

As observed here, over the next six weeks the dayLightLength increases nearly the same number of seconds on a day-by-day basis. (the link above elaborates on this)


Analog vs Digital - Astronomical Observations
#108

Ten days until the Equinox.

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Notice how significant the right gauge moved in the past 11 days!!
(that much change could take 5-6 weeks near the Solstices)


#109

The Equinox has come and passed, but I stalled a few days to be able to showcase this…

Here is 9 days straight… (4 days before and 4 days after the Equinox)

I still find it interesting how the “equal day & night” takes place a few days before the Equinox… not during, as we are taught growing up… (how many days depends on your latitude)

Also worth noting is how the dayLengthPercent crossed 50% about 1.1 days after the Equinox…

I should probably mention that even though the right gauge only displays hours & minutes, the math behind the scenes are actually measuring precise seconds, so this is what is actually happening in real life.
(IE: the day after the Equinox, the dayLength was dead center between the two Solstices)


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