This is the second of the five terms, or bounds, into which the Egyptian table divides Leo. It runs from 6 degrees of the sign to 11, a stretch of 5 degrees held by Venus. It opens where Jupiter's term closes at 6 degrees, and it gives way to Saturn's term at 11 degrees, so a planet moving forward through Leo leaves Jupiter's bound and enters Venus's at 6 degrees exactly.
Set out in degree order, the five terms of Leo run Jupiter (0-6), Venus (6-11), Saturn (11-18), Mercury (18-24) and Mars (24-30). At 5 degrees this is the narrowest of the five, against a widest of 7 held by Saturn. The unevenness is not an accident of copying. No sign in the Egyptian table divides its five terms equally, and no two signs divide them the same way, which is why the table has to be consulted rather than derived.
The five rulers are the five planets visible to the naked eye. The sun and moon take no terms at all in this system, so each sign is shared out among Saturn, Jupiter, Mars, Venus and Mercury, every one of them holding exactly one stretch of it. A planet standing anywhere between 6 and 11 degrees of Leo is standing in Venus's bound, and Hellenistic technique reads the lord of the bound from the degree occupied rather than from the sign as a whole. The table this atlas follows is the Egyptian one, transmitted by Vettius Valens in his Anthologies and recorded by Claudius Ptolemy in the Tetrabiblos, which stayed in ordinary use after Ptolemy set out his objections to it and offered boundaries of his own.