The Event^Horizon 2018/01/05

January 6th, 2018 by Nick Evetts

My thanks to Starstorm for joining in and getting the Maths and Links​96454@N03/39528418921/in/datepost​ed-public/

The formula for the velocity of an object at some distance r from the Sun is:

v = sqrt[GM*(2/r – 1/a)]

Where G is the universal gravitational constant, M is the mass of the Sun, and a is the planet’s semimajor axis.

At perihelion, Earth’s distance from the Sun is r=a(1-e) and at aphelion, it’s r=a(1+e).

G=6.673*10-11 N m2/kg2

M=1.989*1030 kg

a=1.496*1011 m


So plugging in the numbers, the speed at perihelion is 30,300 m/s and at aphelion it’s 29,300 m/s.

At perihelion it is 68175 mph, and at aphelion it is 65925 mph ( Thanks Redshirt_3)​17/12/titans-too-cold-poles-expla​ined​dard/2018/nasa-study-first-direct​-proof-of-ozone-hole-recovery-due​-to-chemicals-ban​18/01/massive-stars-are-common​17/12/astronomers-might-need-to-r​ethink-the-way-black-holes-form-j​ets​/28/astronomers-shed-light-on-for​mation-of-black-holes-and-galaxie​s/

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