Skygrid 03: Spring 2013 to Spring 2014

Data Representation

At long last, the skygrid is done. A year ago, I started the process to capture an image of the zenith sky every two minutes from 4 in the morning until 9 at night. Today the Sun crossed back into the sky of the Northern Hemisphere, and the camera on my porch took the last set of photos of the zenith. Here is the color spread of the equinoctal day:

2014-Vernal-Equinox

And here is the final yearly grid, 495 x 365, or 180,675 separate squares (click to embiggen):

Skygrid-03-Avg-140320

I will be processing another time-lapse movie of the Winter Half of the skygrid when I have time. Until then, check out the Summer Half.

The Skygrid: from Equinox to Equinox

Data Representation

My apologies for the wait on this, but I finally gotten a chance to process the September images up to the 22nd. Here we have the half-year from spring equinox to fall equinox in it’s full glory (click to embiggen):

Skygrid-03-Avg-0922

As mentioned before, I will continue to record the skygrid for a full year, but this image represents the original intent when I started this project in March. Interesting to note: from equinox to equinox I recorded 187 day strips, which is slightly more than half of the 365 days in a year (which would be 182 days). This is because the Earth reaches its aphelion, the furthest distance from the Sun, on July 5th, and is moving slower through this half of its orbit than in the winter half. This means that the Earth takes nine more days to move from the spring equinox position to the fall equinox position than it does to move from the fall to the spring.

So, let’s look forward to tracking the shrinking daylight hours through perihelion and back to the warming days of spring!

The Equinoctal Picture for the Skygrid

Data Representation

The Sun crossed the ecliptic today at 4:44pm EDT, heading south. My skygrid camera was there to capture the moment, along with a plane flying overhead:

Autumn-Equinox

I’ll be processing the images soon so we can see the full wax and wane of the daylight hours. Funny thing: it’s no longer an Equinoctal Skygrid. Because it’s reasonably automated, I’ll continue taking footage until next March, for an Annual Skygrid.