Because the earth is not quite a perfect sphere, the distances get slightly greater toward the poles, where there is a slight flattening. Longitude lines run north and south along the surface of the earth. The earth is divided into two parts, or hemispheres, of east and west longitude. Each hemisphere has 180 degrees. The lines between the slices on the outside of the globe are called meridians.
Meridians are the main lines of longitude on maps.
America has its longitudes described as west of Greenwich, while most of Europe, Russia, India, and China is east of Greenwich. This space narrows as the meridians approach the North and South poles. They are marked in degrees, minutes, and seconds. Find your plant's position on the map. You can now send us your location by using this form or do it when you are ready to send us your flowering dates.