121 reputation
2
bio website dav1dsm1th.azurewebsites.net
location Billericay, United Kingdom
age 49
visits member for 11 months
seen Jul 23 at 18:00

Programming for over 30 years using many technologies - but mostly Microsoft - so T-SQL, C#, VB.net, VB6, JavaScript, VFP, etc., etc.


May
16
comment Determine north just by one shadow
determining the season by the fuzziness of the shadow would be difficult - as the distance to the sun only varies by around 3% - and the seasons are, therefore, determined by the inclination of the earths axis relative to the sun.
Dec
5
comment Changes to Earth's orbit
I see where I've been going wrong. Thanks for taking the time to reply.
Dec
4
comment Changes to Earth's orbit
So when the space shuttle used to fire its retro rockets to slow itself down to allow it to return to Earth, NASA was doing it all wrong and should have been firing their booster to speed up to re-enter the atmosphere?
Dec
4
comment Changes to Earth's orbit
@Envite but if the gravity assist has transferred angular momentum from Earth to Ceres - Earth has slowed down. In my head this would cause Earth's orbit to decay towards the Sun. I imagine an encounter where Earth becomes stationary. At that point, in my head, Earth would not then suddenly accelerate away from the Sun - but fall towards it (like the skaters arms falling to her side when she stops spinning - rather than being torn off and flung into deep space).
Dec
3
comment Could Venus be a source of Earth's water?
I appreciate that, and you taking the time to answer.
Dec
2
comment Could Venus be a source of Earth's water?
Not sure why you think passing through the coma of every comet occurs in 24 hours or less. A cursory examination of the active periods of the major meteorite showers associated with comets produces active periods of several days to (much less often) several weeks. Venus is considerably larger than any comet I've heard of - so I would predict a large coma. Venus always orbits inside Earth's orbit, in the same plane and direction as Earth - so wouldn't Earth line up in the ideal position for extended periods?
Dec
2
awarded  Student
Dec
1
asked Could Venus be a source of Earth's water?
Nov
6
comment Changes to Earth's orbit
I'm going to have to do some more reading... I can't get my head around the idea that the Earth could lose a significant amount of its kinetic energy (in a very unlikely encounter with a large body) and end up flying away from the Sun, rather than falling towards it. Thanks for the response.
Nov
6
comment Changes to Earth's orbit
I'm confused by the assertion in your answer that, if the Earth slows down, its orbit widens (which I assume means it moves further from the Sun). That implies that, as the Earth loses energy, it will drift away from the Sun; rather than falling towards it (which was my understanding of Newtonian physics and gravity). I'm obviously missing something.
Nov
6
awarded  Autobiographer