The Equator is the longest circle of latitude
gravity
No. Unless you count all the satellites and space junk that is circling the earth.
lines of latitude
The period of Earth's time that would be considered longest is the Precambrian Era.
latitude
It is called the equator.
The equator ... the line that contains every point on Earth with zero latitude ...is the longest parallel.
The equator is located at 0 degrees latitude, which means it is located at the circunference of Earth. Earth is shaped like a sphere, and the circumference of a sphere is the longest distance around any part of the sphere. Therefore, this makes the equator the longest line of latitude.
The longest parallel of latitude is the one defined as 'zero degrees', known as the "Equator". All meridians of longitude have the same length ... 1/2 of the earth's polar circumference.
The locus of all points of zero latitude ... sometimes also known as the "Equator" ... is the longest parallel of constant latitude. It's length is the equatorial circumference of the earth ... roughly 24,900 miles (40,073 km) .
The object doing the circling is a satellite of the other. The Earth is one of the Sun's satellites.
Longitude, longitudinal As opposed to latitude (horizontal lines circling the earth.
Equator.
The Equator is the line of latitude located at 0 degrees that represents a line on the Earth's surface equidistant from the North Pole and South Pole. Earth is widest at the equator which is its circumference so this is the longest line of latitude with a length of 40,075.16 km (24,901.55 mi).
The equator is the longest line of latitude as it is located at the circumference of Earth, and the circumference of Earth is always the longest compared to anywhere as the theory is the same of the circumference of a sphere.
The parallel of zero latitude on the earth is usually referred to as the earth's 'equator'.
gravity