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.
- nytimes.com/2014/03/28/opi… Remembering how to fight measles. A concise article in @nytimes by @DrPaulOffit. Similar to his TAM talk. 6 hours ago
- Easily my favourite TAM talk this year. @DrPaulOffit talks about important lessons from the past re: vaccination youtube.com/watch?v=Ys7Sbs… 6 hours ago
- 2 separate car accidents N1 outbound Canal Walk offramp. Looks like 1 car spun out & wrapped itself around a pole. http://t.co/uIaMVhmqAz 7 hours ago
- bit.ly/1rA2eH0 The responsibility of experts. A great @GroundUp_News @article in which @nathangeffen takes @ProfTimNoakes to task. 22 hours ago
- bloomberg.com/news/2014-08-2… Knee Defender gadget for plane flights sees sales jump. Good comment: "This is a device for narcissists and cranks." 1 day 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.