Longitudes are vertical imaginary lines on globe. If it is 3:00am where you are and 7:30am GMT, what is your longitude? One hour of time difference corresponds to 15° of longitude (360°/24 hours = 15°/hour). Because one day is 24 hours long one can easily use time to calculate longitude. Longitude and Time Worksheet 1. The meridian opposite the Prime Meridian (on the other side of the Earth) is the 180° longitude and is known as the anti meridian.
From the distance, you can estimate the travel time using average speed. As Louis Cohen said, you need a Sextant to measure the altitude of the sun: you also need a clear horizon to do that, and a watch showing GMT. I've found some sites on the web that touch on it, but none of them really go in depth with it in a way that I can understand. If you want to have accurate travel time, you need more real time information such as … Suppose an observer sets his accurate watch to 12:00 at noon in Greenwich, England and then travels a great distance.
Modern timekeeping systems use longitudes as references to keep time. I'm looking for any C++ library or in built C++ APIs to determine time zone if latitude and longitude are given as an input. Take for example: 75°57′8″W, a line of longitude. For local times elsewhere, the Earth is divided into 15º longitude bands, each centered on a central meridian.
If it is 10:00pm where you are and 3:30pm GMT, what is your longitude? There are 360 degrees of longitude, and there are 24 hours in a day. The UTM system divides the surface of Earth between 80°S and 84°N latitude into 60 zones, each 6° of longitude in width. That’s not sufficient information to be able to determine the time. Middle line is called prime meridian and value is 0° .
When this meridian lies directly below the Sun, it is noon GMT. Time is determined by the position of the Sun relative to the prime meridian, the zero longitude line running through Greenwich, England. Downloading the GeoNames data and using some spatial index to look up the nearest point is definitely an option, and it will yield the correct result a lot of the time, but it can easily fail if a query point is on the wrong side of a time zone border from the nearest point in the database.
This free time zone calculator converts between different time zones around the world using GMT format, and provides a map delineating standard time zones across the world. You need the latitude as well. I have UTC time with latitude and longitude information, now I would like to convert that to time zone. If it is 5:00am where you are and 7:30pm GMT, what is your longitude?
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