Equinox: Analemma over the Callanish Stones

Equinox: Analemma over the Callanish Stones
Image Credit & Copyright: Giuseppe Petricca
https://apod.nasa.gov/apod/ap180923.html

Does the Sun return to the same spot on the sky every day at the same time? No. A more visual answer to that question is an analemma, a composite image taken from the same spot at the same time over the course of a year. The featured analemma was composed from images taken every few days at 4 pm near the village of Callanish in the Outer Hebrides in Scotland, UK. In the foreground are the Callanish Stones, a stone circle built around 2700 BC during humanity’s Bronze Age. It is not known if the placement of the Callanish Stones has or had astronomical significance. The ultimate causes for the figure-8 shape of this an all analemmas are the tilt of the Earth axis and the ellipticity of the Earth’s orbit around the Sun. At the solstices, the Sun will appear at the top or bottom of an analemma. Equinoxes, however, correspond to analemma middle points — not the intersection point. Today at 1:54 am (UT) is the equinox (“equal night”), when day and night are equal over all of planet Earth. Many cultures celebrate a change of season at an equinox.

Comet 67P’s surface, with depth cues added! — Yes indeed, this is a real image. In November 2014, a little lander…

Comet 67P’s surface, with depth cues added! — Yes indeed, this is a real image. In November 2014, a little lander named Philae disconnected from the European Space Agency’s Rosetta spacecraft and descended to comet 67P/Churyumov-Gerasimenko. Philae was supposed to fire a set of harpoons and attach itself to the surface, but things didn’t go as planned. The spacecraft bounced, tumbled and eventually ended up in the shadow of a cliff. From there, it sent us wonderfully strange hints about where it was in the form of pictures. This surface panorama from Philae on comet 67P is comprised of two separate images. That’s why the crop is so unique. It has been colorized, with depth cues added by Mattias Malmer so we can fully appreciate how absolutely insanely awesome this image is. Credit: ESA, via: The Planetary Society. Read the full story at planetary.org/blogs/guest-blogs/2018/comet67p-depth-cues.html

I thought they were talking about the biggest Chinese brand ;) Jokes apart Zhao is an amazing researcher who visited…

I thought they were talking about the biggest Chinese brand πŸ˜‰ Jokes apart Zhao is an amazing researcher who visited us in Trondheim couple of years ago and one of those who stick to one protein for decades … Not sure if any Scientists developing in Twitter times can hold their focus for such a loooooong time!

https://news.cgtn.com/news/3d3d774d314d7a4d79457a6333566d54/share.html