i think is 10 w and 10 e
grid lines of longitude and latitude
Meridians are typically shown as straight lines radiating out from the center point of the polar projection map. They converge at the poles and represent lines of longitude, which help to indicate direction and location on the map. These meridians help users navigate and understand the spatial relationships on the polar projection.
They are also known as meridians. They all meet at the poles, North & South. On maps and charts they are generally shown to be 10 or 15 degrees apart. At 10 degrees it represents approximately 700 miles at the equator, 350 miles at latitudes 60 N & S. and as mentioned above they all meet at a point at the poles. At 15 degrees it represents 1 hour between noon on the two adjacent 15 degree longitude. So at 0(zero) longitude being noon, then 15 degrees E is 1;00 pm and 15 degrees W is 11;00 am.
Latitude (shown as a horizontal line) is the angular distance, in degrees, minutes, and seconds of a point north or south of the Equator. Lines of latitude are often referred to as parallels. Longitude (shown as a vertical line) is the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime (Greenwich) Meridian. Lines of longitude are often referred to as meridians. Distance between Lines If you divide the circumference of the earth (approximately 25,000 miles) by 360 degrees, the distance on the earth's surface for each one degree of latitude or longitude is just over 69 miles, or 111 km. Note: As you move north or south of the equator, the distance between the lines of longitude gets shorter until they actually meet at the poles. At 45 degrees N or S of the equator, one degree of longitude is about 49 miles. Minutes and Seconds For precision purposes, degrees of longitude and latitude have been divided into minutes (') and seconds ("). There are 60 minutes in each degree. Each minute is divided into 60 seconds. Seconds can be further divided into tenths, hundredths, or even thousandths.
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The parallels of latitude and the meridians of longitude are all straight lines on the Mercator projection. That's why Greenland looks bigger than South America.
Normally, just as shown in the question, as "15 degrees north latitude", or rarely "fifteen degrees north latitude". These are both expressions of the parallel 15° N.
According to the map it is 15 degrees each
To find 20 degrees West longitude on a globe, look for the line that runs vertically, crossing the equator at 20 degrees west of the Prime Meridian. This line will be positioned to the west of the Prime Meridian, which is at 0 degrees longitude. You may need to rotate the globe to see the specific line that corresponds to 20 degrees West.
This geographical point is east of the British Isles, north of the Netherlands and west of Denmark. The sea it is located in is the North Sea.
The cities located between the 35th and 40th meridians include several notable locations. In the United States, cities like Denver, Colorado, and Kansas City, Missouri are situated within this range. Internationally, cities such as Istanbul, Turkey, and Tbilisi, Georgia also fall between these meridians. This region spans various countries and landscapes, showcasing a diverse array of urban centers.
That meridian has no special name. If it's shown at all on a map or globe, it'll be labeled "60".