55. Sura ar-Rahman [most gracious]

The Quranic Text & Ali’s Version:

رَبُّ الْمَشْرِقَيْنِ وَرَبُّ الْمَغْرِبَيْنِ ﴿١٧﴾

55: 17.  (He is) Lord of the two Easts and Lord of the two Wests:

C5184. The two Easts are the two extreme points where the sun rises during the year, and includes all the points between. Similarly the two Wests include the two extreme points of the sun's setting and all the points between. The Dual Number fits with the general atmosphere of Duality in this Sura. Allah is Lord of every region of the earth and sky, and He scatters His bounties everywhere.

See also n. 4641 to 43:38, and n. 4034 to 37:5.

Note:

If we are speaking of longitudes, they may embrace all latitudes. In 55:17 Allah is called "Lord of the two Easts and the two Wests", referring to the extreme points in either case.