reply to post by HighDefinitionFilms
HD, the Lander, the Phoenix Lander, does not move. You are thinking of the rovers, Opportunity and Spirit.
Can anyone please answer my question about the Lat/Long grid on Mars, and why it is different than on Earth? This relates to the Moon, as well.
Yes, there is a 'Prime Meridian' on Mars....but, unlike on Earth, the Longitudinal meridians don't correspond. Can someone explain why? I've
tried to research it, have gotten nowhere.
To refresh.....on Earth, there is the Prime Meridian, called 'zero' degrees, runs through Greenwich, England. This, because as the globe, our
planet was bewing mapped, England tended ot have the high hand....even though Portugal was very sophisticated, as it came to naval
navigation......they kept it pretty secret, hence England one out on this one!!
Anyway....as we learned the true size of our planet, various measuring systems were developed. The term 'knot' was developed, originally, by laying
a rope, that had been previously tied with knots at pre-determined lengths, into the sea, in order to determine the velocity of early sailing vessels.
Counting the 'knots', according to a given time, would determine the speed of the ship.
Hence, the term 'knots' is still used today, although it is far more accurate.
It was determined that, at the Equator, one second of Longitude is egual to 6080 feet.....that is now the accepted distance of one 'Nautical Mile'.
Sorry for all the Metric people out there...conversions are always available!!
To further confuse the issue....one 'Statute Mile' is 5280 feet. (For our international audience, one 'inch' equals 25.4 millimetres. In US
terms, 12 inches equals one 'foot' ....that is 304.8 millimetres, or 30.48 centimetres.
OK....one 'yard', in the USA, is three feet.....so, 30.48 centimetres, times three, is 91.44 centimetres. A meter is just slightly longer than an
American 'yard'....or, three 'feet'.
Confused yet? Don't be....so far I'm only discussing distance measurements!! Won't even get into volumes...!!! Even I can't figure it out!!!
(hint....a litre is pretty close to a quart....)
Where was I? Oh, yeah....a Nautical Mile, which is 6080 feet. My calculator says that 6080 US feet, times 12 inches equals 72,960 inches. Convert
those to centimetres, and we get 185318.4 centimetres....which, when converted to Metres, gives us 1853.184 metres....or, just less than two KM.
Did I do the math correctly?
I do this in my head, usually....used a calcualtor this time. Way to adjust Statute miles to Nautical miles? 1.15 percent. Way to adjust SM to
Metric? 1.6 percent.
Want to look at Celsius temps, and convert to Fahernhight, in your head? Take the temp, in C....double it, and subtract 10 percent, then add 32
degrees. Not difficult, once you practice it.
Quick....20C equals? Double it, it's 40, subtract 10 percent, thats 4....so now we have 36. Add 32.....and we get 78 degrees!!! Congratulations,
you just learned how to convert, in your head, Celsius to Fahernhight!!!
Sorry, I don't spell german words well....not sure how to spell 'fahernhight'
Must add here.....I went long, on this post. A lot of what I wrote has nothing to do with this thread. I could delete it, but I will, instead, post
it, As Is.
This is the 'Aliens and UFOs' thread....if I have educated anyone about real-world stuff, here on Earth, then I achieved my goal.
If I have bored anyone, then I apologize....just scroll thru, nothing to see or learn!
Just hope someone got something from what I wrote. Maybe not the correct venue, but read my sig.......so it seems to make sense......