Longitude (, AU and UK also ) is a geographic coordinate that specifies the east–west position of a point on the Earth's surface, or the surface of a celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Meridians (lines running from pole to pole) connect points with the same longitude. The prime meridian, which passes near the Royal Observatory, Greenwich, England, is defined as 0° longitude by convention. Positive longitudes are east of the prime meridian, and negative ones are west.
Because of the earth's rotation, there is a close connection between longitude and time. Local time (for example from the position of the sun) varies with longitude, a difference of 15° longitude corresponding to a one-hour difference in local time. Comparing local time to an absolute measure of time allows longitude to be determined. Depending on the era, the absolute time might be obtained from a celestial event visible from both locations, such as a lunar eclipse, or from a time signal transmitted by telegraph or wireless. The principle is straightforward, but in practice finding a reliable method of determining longitude took centuries and required the effort of some of the greatest scientific minds.
A location's north–south position along a meridian is given by its latitude, which is approximately the angle between the local vertical and the equatorial plane.
Longitude is generally given using the geometrical or astronomical vertical. This can differ slightly from the gravitational vertical because of small variations in Earth's gravitational field.
If you had your longitude/latitude, and the time/date, how could I go about working out the angle between your normal and the sun?
At first I was doing a simplistic approach of assuming elliptical orbit in only two dimensions and that the Earth is a perfect sphere,Can I get a more accurate...
I think its a defination to have infinite longitudnal lines , if line are not perpendicular than the infinite point will not add up to give the circumferance of equator,
please help
Hi,
I'm pretty happy with my answer to part i). But could I get guidance for my answers to part ii), iii) and iv). I think they are correct... However I'd like to understand that with the data provided is there a way of actually determining the distance for each component to the GC and...
Homework Statement
We need to find the shortest distance between two given cities. For this I'll use Bangkok, Thailand (13°N, 100°E) and Havana, Cuba (23°N, 82°W ). Earth is assumed to be perfectly spherical with a radius of 6.4x106m. These aren't the places we were given but the coordinates...
In most physics introductions Euler angles(pitch, roll, yaw) are defined with respect to Cartesian coordinate system.
If I chose not to use a Cartersian coordinate system but instead use a latitude, longitude and a proprietary vertical coordinate(and no back transformations to Cartersian...
For a small distance (in the range of 10's of metres) how can I calculate the latitude/longitude of a point if I know the distance in ΔN and ΔE from a known latitude/longitude using the 'flat earth' assumption?
Thanks in advance :)
Calculating latitude at noon is easy: say I got ##73^o## on 6/20/2014
So, ##90^o-73^o=17^o##
then ##17^o+(\frac{1}{91})^o=17.01^o##(i forgot how to find N or S:biggrin:
Calculating longitude is also easy: First I set my watch to 12 00 at solar noon.
Then, I find the time difference between my...
Hi there,
I have a peculiar question. Imagine that you are in a Earth position, obtained by google, that gives you the latitude and longitude. Those values are given in the decimal notation (ex: lat=20.44 ; long=-8.5).
Now imagine that you want to know the air pressure in your position...
Hello!
I've been trying to solve this problem for some time but I can't seem to find the answer.
Can you help me?
Homework Statement
On the night of 5th april an observer watches the sunset(η = 3.5 minutes,η = correction of time). The solar disk touched the horizon at 20h 02 m 02 s and then...
Homework Statement
How far apart (in miles) are 2 points on the equator if their longitudes differ by 1 degree?
The correct answer is 69.8 miles, I'm not sure if typo
Homework Equations
S=r\theta
radius of Earth = 3959 milesThe Attempt at a Solution
\theta = 1\deg*\frac{\pi}{180}...
archeoastronomist are bufled at polinesian finding out longitude without a clock
here the concept i just found out how to prove:
you have a dial with two geared counterotating needles you move by hand
every rotation of the sun around you you rotate a needle ten times with which the...
Question:
Calculate the Longitude of the Ascending node for a satellite of Tundra Orbit. Satellite's longitude of perigee is 21.8 degrees and its argument of perigee is 270 degrees. Satellite must cover an Earth station with 21.8 degrees longitude and 63.5 degrees latitude.
My approach...
Dear All
I want to know the formula to extract the longitude of the satellite from the TLE below.
I hope someone can help.
Thanks
1 24652U 96063A 97251.85429118 .00000144 00000-0 00000-0 0 568
2 24652 0.0850 104.0202 0008355 303.2059 279.6585 1.00288964 3492
I have two latitude/longitude points. They are really close together. What I want to do is find the difference between the two longitides and calculate how many yards that would be. If I did the calculation with with the two latitudes, it would be just 2025yds per minute of latitude. However...
Good Day Everyone,
Been searching this site and the internet for over a week and have not found the answer to my questions.
What I want to do, is take the sun's and moon's RA and Dec and convert them to their normal Earth surface coodinate (latitude & longitude).
Also, should I be using...
Java Help!
I have Duty for my Jave class, My teacher needs to disply city and time by Longitude. which I set up to GMT but I have trouble problem. code seems to me work fine, I can't figure out wht's problems. it will be nice to get from you help.
package worldclockdriver;
import...
Hi, I'm trying to convert latitude and longitude into meters (x,y). I was thinking of UTM however I don't understand the equations as the ones I've seen just go on forever. Could somone help me understand how to use these equations?
heres the website that I've been trying to understand...
Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie on approximately the same longitude. Do...
I have an idea how to measure the ecliptic longitude with a sundial type device. Ecliptic longitude is a astronomical variable so I chose this forum.
Suppose we have a verticle flag pole poised on the equator of the Earth.
A "coordinate circle" is drawn that surrounds the flag pole, radius =...
Hello,
in heliocentric coordinates the longitude of the Earth on april 15, 2010 is 204.91°... well I know that the longitude in ecliptic system (centered on the Earth ) is measured from the vernal equinox... if i started measure from V.E. in heliocentric system too I would find the Earth in...
Greetings,
I am trying to figure out how to convert an x,y,z coordinate to longitude and latitude (or right ascension and declination). Center of Earth is origin, of course.
Thanks
I was writing a program to place a markers on a map of the United States, for a Civil War battlemap generator. I tried this:
Assuming x,y and lat/long are superimposed yet different coordinate systems. For example, if a coordinate system with a unary equivalent to 12 on the other were to...
I want to put my data on a map with coastline but I don't know how to do it.
my data has a value on each (lat, lon). I can draw the figure by surf command and indicate it's coordinate by using meshgrid. I want this figure contains coastline so I used hold on to keep the original figure and...
Here's a question. Where do the ecliptic longitude and the right ascension ( of the Sun )reach their maximum difference? What is the declination for these events? What calendar dates do you suppose this happens? I know the answer. I've never heard anyone make this observation except me. These...
[SOLVED] geometric algebra: longitude and latitude rotor ordering?
Was playing around with what is probably traditionally a spherical trig type problem using geometric algebra (locate satellite position using angle measurements from two well separated points). Origin of the problem was just me...
[SOLVED] Latitude Longitude -> Polar Form -> Cartesian Coordinates
Homework Statement
I need to convert 46 Degrees North 80 Degrees west into Cartesian coordinates, based on the assumption that the Earth is a sphere (althought it's not).
Homework Equations...
Homework Statement
An airliner flies from London Heathrow (latitude 51^{o}30' N, longitude 0^{o} 10' W) to Tokyo Narita (latitude 35^{o} 40' N, longitude 139^{o} 45' E). Assuming that the Earth is spherical and the aeroplane takes a great circle route,
a)what is the total distance flown...
Hey I have a lab write up due, and on it I need the accepted value of g and to get it at my longitude, any idea what this means, and how I can figure it out
Hi,
I have a text file with 3 columns (latitude, longitude, & station name) and 51 rows. Using fscanf I am able to read the first row of the file but not the whole file. Any ideas of how to read to the end of a text file that contains both numbers and letters?
This is what I have...
The problem states:
Travelers reset their watches only when the time change is 1.0 h. How far, on avg, must you travel in degrees of longitude until your watch must be reset by 1.0 h.
I don't really understand what this question is asking for, but I attempted to "solve" this by keeping in...