der Äquator
equator
The imaginary, longest line of latitude that divides the Earth into a northern and a southern hemisphere.
Länder, die am Äquator liegen, haben ein tropisches Klima.
Countries that lie on the equator have a tropical climate.

equator
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equator
The imaginary, longest line of latitude that divides the Earth into a northern and a southern hemisphere.
Länder, die am Äquator liegen, haben ein tropisches Klima.
Countries that lie on the equator have a tropical climate.

To indicate a position, you use 'am Äquator' (on/at the equator). When crossing the line, you say 'den Äquator überqueren' (to cross the equator, with the accusative).
Die Stadt Quito liegt fast direkt am Äquator.
The city of Quito lies almost directly on the equator.
Location is often described relative to the equator. For this, constructions such as 'nördlich des Äquators' (north of the equator) or 'südlich vom Äquator' (south of the equator) are used.
Deutschland liegt auf der Nordhalbkugel, also nördlich des Äquators.
Germany is in the Northern Hemisphere, so north of the equator.
The adjective 'äquatorial' (equatorial) is derived from the noun 'der Äquator' (the equator). It is used to describe things that are typical of this region.
In der äquatorialen Zone gibt es oft Regenwälder.
There are often rainforests in the equatorial zone.
meridian
'der Äquator' and 'der Meridian' are both imaginary lines on the Earth and appear in geography. That is why they can easily be confused. The equator runs all the way around the Earth and divides it into the Northern Hemisphere and the Southern Hemisphere. A meridian, by contrast, runs from pole to pole and is part of geographic longitude. Put simply: the equator goes horizontally around the Earth; a meridian goes from north to south.

Auf der Karte sieht Simon, dass der Äquator durch mehrere Länder in Afrika verläuft.
On the map, Simon sees that the equator runs through several countries in Africa.
Der Nullmeridian läuft durch Greenwich und hilft bei der Bestimmung der geografischen Länge.
The prime meridian runs through Greenwich and helps determine geographic longitude.