{"id":19998,"date":"2016-02-08T03:01:02","date_gmt":"2016-02-07T17:01:02","guid":{"rendered":"http:\/\/www.rjmprogramming.com.au\/ITblog\/?p=19998"},"modified":"2016-02-07T18:00:37","modified_gmt":"2016-02-07T08:00:37","slug":"php-earth-rotational-speed-primer-tutorial","status":"publish","type":"post","link":"https:\/\/www.rjmprogramming.com.au\/ITblog\/php-earth-rotational-speed-primer-tutorial\/","title":{"rendered":"PHP Earth Rotational Speed Primer Tutorial"},"content":{"rendered":"
\"PHP<\/a>

PHP Earth Rotational Speed Primer Tutorial<\/p><\/div>\n

We discovered a way to calculate the Earth’s rotational speed for a given latitude. When you see how fast we’re moving relative to somebody still in space you’ll be amazed and think gravity is pretty cool. Even if you’re standing on your head right now, you’d have to agree with me that “ytivarg” is not such a bad concept also … “can tell you it saved my bacon back in ’66 when that boar from yonder ridge fell on me when I was stuck practising them thar cartwheely thingos, and got stuck not the right way up … if youse knows what ah mean”<\/i> … but we digress.<\/p>\n

The Earth is like a ball with a rod through it coming out at the North and South poles, and if you can imagine this, then you can probably imagine that the rotational speeds are the biggest near the Equator and get a lot smaller near the Poles.<\/p>\n

Still and all, at pretty big latitudes like for Archangel, in Russia, the rotational speeds get up with what we were taught was the speed of a Jumbo jet … back in the day. As for Singapore … wow … take a look at our tutorial picture<\/a> or try a live run<\/a> for yourself, and this is our PHP source code you could call rotational_speed_at.php<\/a><\/p>\n

Ahhhh … the “where” of life … so interesting?!<\/p>\n

Believe it or not, the equation to calculate this we found in “New Century Maths 9 (second edition) Stages 5.2\/5.3”<\/i> so thanks. It goes like …<\/p>\n


\nEarth Rotational Speed (in km\/h) = ( 2 x Π x 6371 x cos(latitude) ) \/ 24
\n<\/code><\/p>\n

… where 6371<\/i> will do as radius of Earth in kilometres and 24<\/i> is the number of hours in an Earth day and latitude<\/i> (for most functionalities such as Javascript’s Maths.cos() function) should be expressed in radians (where 1 degree = ( 1 x Π ) \/ 180 radians), and Π is, well, Π<\/a><\/p>\n

If this was interesting you may be interested in this<\/a> too.<\/p>\n