Translation of the verse 7 from Surah An-Najm : Number of verses 62 - - page 526 - Part 27.
While he [Jibrael (Gabriel)] was in the highest part of the horizon,
While he was in the higher [part of the] horizon.
(53:7) being on the higher horizon. *7
*7) The horizon means the eastern edge of the sky where the sun rises and the day dawns. The same has been referred to as ufuq mubin (bright horizon) in Surah Takvir: 23. Both the verses make it explicit that when the Holy Prophet (upon whom be peace) saw Gabriel (peace be upon him) for the first time, he had appeared on the eastern horizon of the sky; and there are several authentic Traditions which show that at that time he was in his real shape in which Allah has created him. We shall quote all such Traditions below. -
Source : An-Najm Verse 7: While he was in the higher [part of the] horizon.