Please also post the year of your birth, so we can calculate your rising sign accurately for you. The day and month is not enough info, as signs vary somewhat from year to year. This said, I picked 1980 and also 1981, 83 and 84 and calculated the rising sign each time as Sagittarius, so I think you almost certainly have Sagittarius rising, unless you were born between 1942 and 1945, in which case your rising sign is likely to be Scorpio due to Tokyo time being imposed by Japanese conquerors. Singapore time zones have an interesting history. Check out http://www.astrologycom.com/sagasc.html. It looks like the "Rule of Thumb" calculator is not quite correct in your case, but then we do say it is just rule of thumb and, to be sure, you must get the chart drawn up accurately.
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I am more and more confusing after researching all the 12 signs and went to many horoscopes website to find out what sign am i really are for months already...
some site state tat my rising sign is Scorpio, others site state tat my rising sign is Sagittarius... however this site state that i am Capricorn, but almost all of the info stated in Capricorn rising doesn't match me at all...
any idea which rising sign am i belong to??
btw my birth date and time is 5th of august at 14:37, born in Singapore...