knowing the chart of the missing person would put it into a natal astrology study, as opposed to a horary study. i would be curious too if that is something that can be known.

Yes, it is true. I am taking help of natal astrology. The horary chart appearing in this thread is pointing to the sign of Gemini, or you can say that the key to the answer is 'Gemini. The person went missing in the month of Gemini i.e 21st May 2013. I want to make sure:

Is this missing related to disease?
Murder? or
Abduction (human or otherwise)...

Sign of Gemini points to all of these. The discussion I am having is 'Off-topic', so it can be moved to 'PM'.

Sid is still missing and no clues have emerged.His status was "upgraded" to a medically dependent missing person and family and friends are spreading out in their search for him.They also now have a reward offered

I have gone over this chart many times and I believe he is dead but maybe it is his just his mind that died.
The significator of Sid is Mars in Gemini , ruler of 7th and is placed in 8th house
We have already said Mars is debilitated in Gemini.Sid's brain injury came from a fall [3 stories high] and/ or does this represent that he is located High up[Gemini suggests high ground or higher reaches in a building]
The moon as co-significator is in Pisces in the 6th applying to the POF in cancer-what meaning has that?
Do we take his whereabouts from the radical 8th making it wsw from where he was last heard from or do we turn the chart which would be 2nd house and then it would be north east?
The Gemini influence in the turned charts 3rd house would describe the theme before his disappearance. He went back to his high school to visit a former teacher to pick up something
There is no aspect between Mars his ruler and the ruler of his 4th [home] so I do not believe he would find his way home on his own
So, I can see brain injury , confusion, possible drowning and I believe he is still close to where he was last heard from being in a succedent house
Any insights? [I do now have permission from my friend to look at this]

Sorry to hear he's still missing

As I think Jupiter is his significator and since its heliacal rising around 11th July didn't bring any news about the boy, the next possibility of finding him would be around 25th August when transiting Jupiter comes to the angle of MC.

However, according to Masha'allah, when the significator is cadent we should operate through its lord to time the event. Mercury is going to reach the angle of ascendant around 15th September and will enter its own sign of Virgo on 24th of August, but this date is probably (much) less likely to time the event because Virgo is the cadent 12th sign. Still,it is perhaps worthy of note that it coincides with Jupiter's arrival on the MC.

We'll see...
I hope it will be much sooner than any of these dates.

Regards,
Goran