Aspects and declination in ancient astrology

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Hello fellows astrologers.Since some years,ancient astrology has attracted the interest of a larger audience,mainly because of efforts of Project Hindsight.One important astrologer of hellenistic times,Dorotheus of Sidon,talks about aspects between planets in way unknown to modern astrology.According to Dorotheus,(and he represents the mainstream of greek astrology),aspects between planets only exist when both planets are IN THE SAME DECLINATION ! look to what he wrote:"look at the casting of rays in latitude also because sometimes a planet is aspecting from opposition,and if you calculed it in latitude and if you find one planet in south,the other in the North,then THIS IS NOT IN OPPOSITION,AND ALSO DOES NOT CAST ITS RAYS, ...(Carmen Astrologicum,book 3-1,p?g 241 -Astrology classics publisher-2005).
Well my friends,i would like to hear your opinion about it.
All the best
Gerson
"Life is a gift,enjoy"