Birth details
What changes when a birth time is unknown?
Not knowing a birth time is common. A chart remains useful when it distinguishes positions that can be calculated without it from markers that depend on it.
What remains available
The Sun and most planetary positions can be calculated from a date and place. Astroflair uses local noon as a technical convention when the time is unknown, then says so. That choice does not turn a missing time into certain information.
The Moon moves faster than the other celestial bodies. Depending on the date, its sign or some distances may call for extra caution. A good reading separates what is stable from what would depend on a more precise time.
What is removed
The Ascendant, Midheaven, houses and angles require a birth time. They are not shown when it is missing. Inventing them would make the result look fuller, but less faithful to the available details.
This limit also affects a relationship comparison: contacts to angles or certain houses cannot be interpreted without calculating them. The rest of the chart can still support a more modest reading.
When only one birth time is unknown, both people’s planetary positions can still be compared. Astroflair calculates the person without a time at local noon, but omits that person’s houses and angles: contacts to their angles and overlays into their houses are not offered. The houses and angles of the person with a known time remain calculated.
A detail to add later
If a time is found, the chart can be calculated again: new markers become available while the date and place remain the same. There is no reason to promise that this precision changes everything; it simply makes some calculations possible.
Before then, it is possible to explore the available positions and keep their precision in mind. The quality of the question brought to a reading matters as much as the number of displayed elements.
References and method
Displayed convention: local noon; houses and angles omitted.