As per my system,taking birth time 7.25 pm and prior to it, your ascendant is cancer.Taking time as 7,27pm onwards your ascendant comes our leo.Now you are asking me how cancer sign ?
Perhaps you skipped or ignore ayanamsa part.
What is ayanamsa and how this helps for accurate reading?
This is advance portion which you might be even not interested.
If you are a leo born this does not mean you will be empowered with all of the leo traits.For that you have to dwelve deeper studying placement of ascendant,moon and sun in D-3 (dreshkon chart),D-9 (navamasa chart) and in D-30 (trimashamsa chart).The signs in which ascendant,moon and sun falls,their ruler decides the nature,traits of the person.
So total nine signs (three for each divisional chart) of D-3,D-9 and D-30,which will be occupied by ascendant,moon and sun.
Suppose your ascendant,moon and sun falls in in virgo, leo, and capricorn,cancer signs of these divisionals, then we will say,you have brilliant mind (mercury ,ruler of virgo),have leadership qualities (leo sign) and you have sharp memory (capricorn) ,sensitive or emotional being in cancer.
These are very important factors.You can not judge simply from natal chart that if your ascendant is leo,then all traits will comprise in you of leo.
This is misconception in general for modern astrology.
In ancient astrology which is arround 5000 years old,have descirbed it accurately explaining importance of divisional charts.These helps to rectify a natal chart birth time upto seconds.Past events of life are also important while rectifying birth time.
I have stretched this subject a little longer,may be you could grasp this part or not,that is upto you.
Let me know when your father died,i mean month and year, this will surely fix your ascendant as this should reflect in your chart and in D-10..!!
-Anup
www,kascorner.com