The question wells up inside you.
You ask the Astrologer.
A Prashna is born.
You might be physically in Honolulu.
Astrologer might be in Hong Kong.
Astrologer casts for Hong Kong.
You might have been born in Hanoi, but you’ve asked Astrologer who is physically in Hong Kong, and therefore…
…Astrologer casts Prashna chart for Hong Kong.
The question flashed in your mind at a particular time, but you ask the Astrologer at a later time.
Astrologer casts the Prashna chart for the time when the Prashna is asked, i.e. the later time.
You call the Astrologer, asking for an appointment. You get the appointment.
Astrologer casts Prashna chart for the time of call, not for the time of appointment.
Let’s assume an Astrologer is taking a break.
You call to ask.
Astrologer not home.
However, he or she has trained his or her family members to receive queries.
He or she comes back, and casts Prashna chart for time of query received, not for time of query related by family member to him or her.
Let’s say that it is a known fact that an Astrologer practises Astrology during fixed hours.
You arrive, with your Prashna.
Now, why should the Astrologer limit him or herself to those few Prashna Lagnas that are available during those fixed hours?
The Astrologer then devises a way to fix Prashna Lagna.
For example, you can be asked to choose a blank square of a South Indian style chart. The square you choose serves then as Prashna Lagna.
A variation the Astrologer can use here is to pre-decide where Aries is on this blank South Indian style chart.
There are various methods to fix the Prashna Lagna if the need arises. One can even devise one’s own method, using mathematics for example, as in “Think of a number…”.
When a Prashna is born, the Universe has been tapped for an answer.
The Astrologer is the conduit for the answer to come though.
The Astrologer’s means to connect to the Universe is the Prashna chart.