This is a Fire Rainbow, one of the rarest weather phenomenon on Earth. In order for this effect to be achieved the clouds have to be Cirrus and 2kms high, and there must be a sufficient density of ice crystals in the air in order to refract and reflect the sunlight. The crystals need to be fairly large and plate-shaped. The sunlight then needs to strike the crystals at exactly 58 degrees, and voila! One of the most beautiful things I’ve never seen. This gorgeous optical phenomenon is also known as a Circumhorizontal arc or ice-halo. Variations of the phenomenon include the Infralateral arc and the Supralateral arc.
- bit.ly/1nGpih4 Are 90% of academic papers really never cited? Reviewing the literature on academic citations. 6 hours ago
- space.com/25586-nasa-lea… US leading the path to Mars: NASA Chief Charles Bolden (op-ed). #space 14 hours ago
- Stunning cloud formations. The disks were more pronounced before I took the pic. Cumulus & lenticular clouds maybe. http://t.co/DKPQ85NbMV 14 hours ago
- This is wonderful youtu.be/WIlPFRsseQ8 Vid: The Royal Dutch Guide Dog Foundation (KNGF) commercial for veteran dogs 1 day ago
- engineergirl.org This is a great site committed to getting more girls & women excited about the fields of engineering 2 days ago
Keep an eye on:Free Society Institute South Africa. A non-profit society encouraging skepticism and secularism in South Africa.
Astronomy picture of the day archive by NASA. This is one of my all-time favourite sites. I visit it every single day & so should you.
Bad Astronomer Phil Plait blogs at Slate.
Astronomy Education is a compilation of direct links to homepages of different astronomy and space websites.