Doodle Science - July 2019

Circulated to schools, organisations and individuals - covering primary science and related bits and bobs.

SunDog
The above image is of a sundog, or mock sun. These are caused by light being refracted by ice crystals in the high atmosphere, the differing shapes of the crystals can cause a varying effects. The most spectacular of these phenomena are arcs across the sky ans one of the commonest is the circumzenthal arc. These are apparently more common than rainbows but people do not see them as they spend their time looking down. See Atmospheric Optics for pictures and information.
Great Dates in Sci and Tech for July

1st, 1858 Darwin and Wallace's paper on Natural selection is read to the Linnean society. (Good)
3rd, 1844 the last pair of Great Auks is killed (Bad)
and in 1886 Benz unveils the first purpose build car. (Probably Good)
5th, 1687 Newton published the Principia (Good)
10th, 1962 Telstar is launched, the first communications satellite (Good)
and in 1997 Scientists announce that DNA evidence supports the out of Africa theory of human evolution placing "African Eve" at between 100,000 and 200,000 years ago. (We are all closely related, probably Good)
19th, 1912 a meteorite explodes over Holbrook Arizona and showers 16,000 bits on the town. (Bad, but interesting)
21st, 1969 Armstrong and Aldrin walk on the Moon. (Good)
25th, 1978 the first test tube baby is born. (Good)


In the Sky this month

July 2 - New Moon.
July 2 - Total Solar Eclipse. A partial eclipse will be visible in most parts of the southern Pacific Ocean and western South America.
July 9 - Saturn at Opposition.
July 16 - Full Moon.
July 16 - Partial Lunar Eclipse. The eclipse will be visible throughout most of Europe, Africa, central Asia, and the Indian Ocean.
July 28, 29 - Delta Aquarids Meteor Shower.



Interesting links


Science Biscuits Interesting

Wonderful Cephalopods Well worth a look, I met some while snorkelling and I am never eating Calamari again.


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