About Arabic Parts, they offer hints or clues in our astrological lives, profiles and horoscopes. I can name 3 similarly placed parts: the part of marriage: 8' 50" Virgo, the part of widowhood: 8' 50" Libra, and the part of pregnancy: 8' 50" Scorpio. They need plus your natal moon minus natal sun degrees/minutes to find out the exact personal natal parts. I guess 9' will be the closest degree. And what about Sun 0'-1' Aries people? or if it ever lands on Moon 0'-1' Aries?
Arabic parts calculator is useful and handy to figure out the math in our astrological charts.
http://libracentre.com/arabic_parts_chart.php
My own part of marriage: Personal (or fixed) point is 8'50" Virgo plus significator the Moon at 20' 17" Aquarius subtract or minus the Sun 26' 20" Aquarius = mine is 2' 47" or 3' Virgo.
My own part of widowhood: 8' 50" Libra plus same Moon minus same sun = 2' 47" Libra.
LibraCenter has ASC (17' 33" Cancer) + 8' 50" Libra - Neptune 22' Sag = mine is 3' Taurus.
My own part of pregnancy: 8' 50" Scorpio plus the Moon minus the Sun = 2' 47" Scorpio.
My two parts of divorce: ASC 17' 33" Cancer plus Venus 2' Aries minus Cusp 7th-Capricorn (17' 33" opposite) = 7' Libra. And ASC 17' 33" Cancer plus Capricorn 17' 33" minus Saturn 24" Virgo = 0' Aquarius (my own sun/moon sign).
And there are 4 different parts of marriage: 2 for men (AM sun 1st-6th houses and PM sun 7th-12th houses) and 2 for women (AM sun and PM sun). The part of marriage for all is ASC 17' 33" Cancer + 17'33 " Capricorn (cusp 7th) - Venus (7' Aries) = mine is 18' Capricorn.
Edit: 15' Cancer is the part of journeys, esp. water (cruise trips), represented by the sign of the seas.