It seemed to take Sirius an age to fall: his body curved in a graceful arc as he sank backward through the ragged veil hanging from the arch.

The amount of sky that you can view through a telescope is called the real (true) field of view and is measured in degrees of arc (angular field).

Through them, every Pakistani and Bangladeshi is familiar with the wedding-cake architecture of the Taj and the arc of the Gateway of India, symbols of the city that gives the industry its name.