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[caption id="" align="alignright" width="300" caption="Image via Wikipedia"] Snorting Amoxicillin, [/caption]

I know I have gone on about Northing and Eastings before, Snorting Amoxicillin coupon, but today I thought you might want to research Lat and long, and why a man called Harrison is so important. The two videos I have included below are perfect in that the first explains just what lat and long are, the second although its a school video, is perfect in explaining time and longitude.

Basically, pre about 1760, Snorting Amoxicillin canada, Latitude was easy to establish and use, it's just a simple angle of the sun, but longitude was not, sailors had great difficulty calculating it, the angle of the sun, 750mg Snorting Amoxicillin, and stars just did not help, the moon might help and for a long while its was the best method.

As the second video explains all to simply, the earth is divided into 360 degrees of Longitude, often called meridians, and as one revolution of the earth is 24 hours, 1 hour is equal to 15 degree's of longitude , if sailors could keep accurate time they could work out the time at their base port, and the time at mid day at their present position and easily work out which meridian they were at, Snorting Amoxicillin. Enter stage right, Mr John Harrison, he is important, because at this time, say pre 1760 ish, 1000mg Snorting Amoxicillin, time keeping was for the Rich and not very accurate at that, a clock might loose 20 mins a day or more . most if not all were pendulum based, try putting that on a boat and see just how good it was, so hence sailors did not know time very well, 30mg Snorting Amoxicillin, so Harrison's invention of an accurate time piece that did not rely upon a pendulum, but a spring and did not become affected by both temp, ie the expasion and contraction of the metal, and humidity was a revelation to travellers they now had an accurate way to keep time at sea, by knowing the accurate time at their home port and with the difference in time from mid day at their present position, they could easily tell their longitude position.

Why should you as technologists need to know this, 150mg Snorting Amoxicillin, well location is all to us, we need to accurately position our buildings, although we mostly use Nothing and Easting because they are based upon a square grid, the root of the grid is a Lat and Long. If you take a photo nearly all cameras attach a global position in the form of Lat and long, our little navigation devices on you phone or car are Lat and long based, Snorting Amoxicillin japan, so understanding a little about it, helps you to check and understand the diference between lat/long and Northing and Easting, and why time is so important. The CPD here is obvious, its part of basic surveying,you might argue that the satellite system we have is all you need, but you should know why, Snorting Amoxicillin overseas, you might also want to research the maps of the time to understand a little more about map making.

The basic story of Harrison is not just the time keeping thing its about the man as well, the way his invention was almost scuppered by the committee, who wanted to use their own moon table method and other watch makers who wanted to steal his invention, an excellent read. 200mg Snorting Amoxicillin,