Editing Control of Navigation (section)

==Process of preparing the ephemeris==

For navigation, the Priestesses would need to gather several different kinds of information, not just star positions. Historically, real navigators relied on a mixture of astronomy, observation, and accumulated experience. The Priestesses could control all of these sources.

Here are the main ways they would obtain the information.

====Systematic Observation of the Stars====
This is the foundation. Priestess-astronomers observe the sky every clear night for many years.
They record:
* When important stars rise and set
* The height of stars above the horizon
* Which constellations appear in different months
* The position of a polar star (if one exists)
* The movement of the sun along the horizon through the year

'''How they measure things'''<br>
They could use simple historical instruments:
* Gnomon – a vertical stick used to measure the sun's shadow.
* Astrolabe or quadrant – measures the angle of a star above the horizon.
* Armillary sphere – a model of the heavens used for teaching and calculations.
Over decades this produces extremely reliable star tables.

====2. Reports from Navigators====
The Navigators themselves provide a huge amount of data.
Every captain returning from a voyage would report things like:
* When certain stars were directly above the mast
* The length of the voyage
* Wind direction
* Currents
* Sangerous shoals or reefs
* Storm seasons

Temple scribes record these reports.
Over time the Priestesses build a large archive of sailing knowledge. This also reinforces their authority because:
* Navigators must report to the temple
* The temple becomes the central repository of knowledge

====3. Coastal Surveying====
Priestesses may send survey expeditions. They measure:
* Latitude of important ports
* Direction and distance between islands
* Coastal landmarks
* Depth of water near harbours
This might involve:
* Measuring the height of the pole star
* Tracking the sun at noon
* Estimating distance sailed per day
These observations produce early maps and sailing routes.

====4. Seasonal Wind Records====
Ocean sailing depends heavily on wind patterns.
Priestesses would keep records of:
* Prevailing winds in different months
* Storm seasons
* Calm seasons
This knowledge may come from:
* Ship logs
* Fishermen
* Temple coastal watchers
Over decades they create wind calendars.
Example:
{| class="wikitable"
! Season !! Typical wind
|-
| Early Spring || Steady western winds
|-
| Late Summer|| Violent storms
|-
| Autumn || Reliable eastern trade winds
|}
This is extremely valuable for navigators.

====5. Ocean Current Knowledge====
Currents affect travel time and direction.
Navigators report:
* Drifting patterns
* Floating seaweed
* Water temperature
* Speed differences between routes

Priestesses compile this into route advice.

Example:
"Ships sailing to the southern islands should steer east of the Sapphire Reef to avoid the northward current."

====6. Celestial Calendar====
The Priestesses also maintain the official calendar.
They track:
* Solstices
* Equinoxes
* Lunar phases

This helps sailors:
* Estimate time during voyages
* Know the best sailing seasons
* Predict tides (if the moon affects them strongly)

====7. Mathematical Correction====
The Priestesses could also perform calculations.

For example:<br>
If navigators report star height at sea, the priestesses can calculate latitude tables.

This is exactly what medieval and Renaissance astronomers did.

Navigators might use rules like:<br>
"When the Star of the High Crown stands 30 degrees above the sea, you are at the latitude of the Northern Isles."

====8. Continuous Updating====
The key to priestess power is long-term records. Each generation adds more data. After 100 years they would possess:
* star tables
* sailing directions
* wind calendars
* maps
* route guides

No individual navigator could accumulate this much knowledge alone. Thus the Guild depends on the Priestesses.

====Why This Works Well in Your World====
This system lets the Priestesses control navigation without sailing themselves.
They control:
* The astronomy
* The archives
* The charts
* The calendar
Navigators may appear independent, but all their knowledge ultimately comes from the temples.