Home |
Search |
Today's Posts |
#21
|
|||
|
|||
Calculating distance from Lat/Long
Not too surprising...I meant to mention that the inverse cos is
intended to provided an angle in *radians* 1 radian = 1 degree X 180/pi or about 57 degrees. Brian W On Fri, 05 Dec 2003 02:51:48 GMT, (Larry W4CSC) wrote: Fifty seven lurkers just headed for the Tylenols with their heads spinning, feeling nauseated and dizzy....(c; I love my Nautical Almanac..... I love my Nautical Almanac..... I love my Nautical Almanac..... I love my Nautical Almanac..... and GPS... On Fri, 05 Dec 2003 00:27:38 GMT, Brian Whatcott wrote: First, an explanatory note: inverse cos is also known as arc.cos or cos^-1 The great circle distance is given by Earth radius * arccos [cos Lat1* cos Lat2 * cos (Long1 - Long2) + sin Lat1 * sin Lat2] The Earth (equatorial) radius is 6378 km, or 3963 statute miles or 3442 NM. Does this help? (There are other formulae for the same result...) Brian Whatcott Altus OK Larry W4CSC NNNN |
#22
|
|||
|
|||
Calculating distance from Lat/Long
On Fri, 05 Dec 2003 04:04:13 GMT, Brian Whatcott
wrote: Not too surprising...I meant to mention that the inverse cos is intended to provided an angle in *radians* 1 radian = 1 degree X 180/pi or about 57 degrees. Brian W My head is still buzzin', but that might be the Boddington's Ale, not spherical trig....(c; Larry W4CSC NNNN |
#23
|
|||
|
|||
Calculating distance from Lat/Long
On Fri, 05 Dec 2003 04:04:13 GMT, Brian Whatcott
wrote: Not too surprising...I meant to mention that the inverse cos is intended to provided an angle in *radians* 1 radian = 1 degree X 180/pi or about 57 degrees. Brian W My head is still buzzin', but that might be the Boddington's Ale, not spherical trig....(c; Larry W4CSC NNNN |
#24
|
|||
|
|||
Calculating distance from Lat/Long
Huh? The earth isn't flat? When did that happen? (tic)
|
#25
|
|||
|
|||
Calculating distance from Lat/Long
Huh? The earth isn't flat? When did that happen? (tic)
|
#26
|
|||
|
|||
Calculating distance from Lat/Long
Dumb Ass! It's round. Kinda like a dinner plate. Be careful when you get
close to the edge. When Joshua Slocum was sailing around the world and meet a head of state in some island nation, that was the excepted explanation. Steve s/v Good Intentions |
#27
|
|||
|
|||
Calculating distance from Lat/Long
Dumb Ass! It's round. Kinda like a dinner plate. Be careful when you get
close to the edge. When Joshua Slocum was sailing around the world and meet a head of state in some island nation, that was the excepted explanation. Steve s/v Good Intentions |
#28
|
|||
|
|||
OT: Homeland Defense attacking Higher Math
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html head meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1" title/title /head body text="#000000" bgcolor="#ffffff" font face="Courier New, Courier, monospace"Off topic, but funny as hell:br br ==============================br At New York's Kennedy airport today, an individual laterbr discovered to be a public school teacher was arrested tryingbr to board a flight while in possession of a ruler, a protractor,br a setsquare, a slide rule, and a calculator. br br At a morning press conference, Attorney general John Ashcroftbr said he believes the man is a member of the notorious al-gebrabr movement. He is being charged by the FBI with carrying weaponsbr of math instruction. "Al-gebra is a fearsome cult,", Ashcroftbr said. "They desire average solutions by means and extremes, andbr sometimes go off on tangents in a search of absolute value. Theybr use secret code names like "x" and "y" and refer to themselves asbr "unknowns", but we have determined they belong to a commonbr denominator of the axis of medieval with coordinates in everybr country. "As the Greek philanderer Isosceles used to say, therebr are 3 sides to every >triangle," Ashcroft declared. br br When asked to comment on the arrest, President Bush said, "If Godbr had wanted us to have better weapons of math instruction, He wouldbr have given us more fingers and toes. "I am gratified that ourbr government has given us a sine that it is intent on protracting usbr from these math-dogs who are willing to disintegrate us with calculusbr disregard. Murky statisticians love to inflict plane on every spherebr of influence," the President said, adding: "Under the circumferences,br we must differentiate their root, make our point, and draw the line."br President Bush warned, "These weapons of math instruction have thebr potential to decimal everything in their math on a scalene neverbr before seen unless we become exponents of a Higher Power and begin tobr factor-in random facts of vertex." br br Attorney General Ashcroft said, "As our Great Leader would say, readbr my ellipse. Here is one principle he is uncertainty of though theybr continue to multiply, their days are numbered as the hypotenuse tightensbr around their necks." br br br -- br Jon Gauthierbr br Given the likely reaction to an increase inbr terror-alert level to "severe threat imminent,"br wouldn't a more appropriate alert color be brown?br -Brad Simanek on a class="moz-txt-link-abbreviated" href="http://www.ruminate.com"www.ruminate.com/a/font /body /html |
#29
|
|||
|
|||
OT: Homeland Defense attacking Higher Math
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html head meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1" title/title /head body text="#000000" bgcolor="#ffffff" font face="Courier New, Courier, monospace"Off topic, but funny as hell:br br ==============================br At New York's Kennedy airport today, an individual laterbr discovered to be a public school teacher was arrested tryingbr to board a flight while in possession of a ruler, a protractor,br a setsquare, a slide rule, and a calculator. br br At a morning press conference, Attorney general John Ashcroftbr said he believes the man is a member of the notorious al-gebrabr movement. He is being charged by the FBI with carrying weaponsbr of math instruction. "Al-gebra is a fearsome cult,", Ashcroftbr said. "They desire average solutions by means and extremes, andbr sometimes go off on tangents in a search of absolute value. Theybr use secret code names like "x" and "y" and refer to themselves asbr "unknowns", but we have determined they belong to a commonbr denominator of the axis of medieval with coordinates in everybr country. "As the Greek philanderer Isosceles used to say, therebr are 3 sides to every >triangle," Ashcroft declared. br br When asked to comment on the arrest, President Bush said, "If Godbr had wanted us to have better weapons of math instruction, He wouldbr have given us more fingers and toes. "I am gratified that ourbr government has given us a sine that it is intent on protracting usbr from these math-dogs who are willing to disintegrate us with calculusbr disregard. Murky statisticians love to inflict plane on every spherebr of influence," the President said, adding: "Under the circumferences,br we must differentiate their root, make our point, and draw the line."br President Bush warned, "These weapons of math instruction have thebr potential to decimal everything in their math on a scalene neverbr before seen unless we become exponents of a Higher Power and begin tobr factor-in random facts of vertex." br br Attorney General Ashcroft said, "As our Great Leader would say, readbr my ellipse. Here is one principle he is uncertainty of though theybr continue to multiply, their days are numbered as the hypotenuse tightensbr around their necks." br br br -- br Jon Gauthierbr br Given the likely reaction to an increase inbr terror-alert level to "severe threat imminent,"br wouldn't a more appropriate alert color be brown?br -Brad Simanek on a class="moz-txt-link-abbreviated" href="http://www.ruminate.com"www.ruminate.com/a/font /body /html |
#30
|
|||
|
|||
Calculating distance from Lat/Long
Dear Lloyd,
I've picked this up rather late. If you still require the answer[s] then get back to me including telling me whether you have a book of tables known as "Norries Tables". If not I can give you an arithmetic method by calculator. Basically you work out the D'Lat [difference in minutes of latitude] and Dep(arture), then converting Dep into D'Long [differnce in minutes of Longitude]. From which can be determined Dist(ance) and Co(arse) made good, or of course the reverse having only course and distance find the rest. Chris Spreckley "Lloyd Sumpter" wrote in message news Hi, I'm writing a program for Linux that displays position (from GPS) on a scanned-in chart, and would like it to calculate distance from current position to the cursor. How do you calculate distance between two points using lat/long? If they're due North/South, I can do it ( 1 minute of lat = 1 NM) but how do you calculate distance from longitude? Perhaps some formula based on the circumfrence of the Earth at the equator and the latitude? Lloyd Sumpter |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Long Distance carrier for cruisers? | General |