___________ is the largest circle.

A time zone is a region that covers ________ of longitudes.

IDL stands for

The two diametrically opposite lines make a full circle also known as ___________.

____________are calculated according to the angle a place makes with the centre of the earth.

All longitudes are part of a _________.

Great circle routes are specially important for places that are an opposite sides of the  ___________.

The uniform time based on a central meridian is known as the ___________.

____________ is the longest line latitude.

Lines of latitudes are ______________.