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An example 'chart sphere' animation.
3D Houses
Left: Classic 2D model ofhouses. Right: Accurate 3D model of houses.
- All 12 houses are the same size and always cover the same proportions ofthe local horizon.
- A planet above the horizon will always be in houses 7-12.
- A planet below the horizon will always be in houses 1-6.
- A planet east of the meridian will always be in houses 1-3 or 10-12.
- A planet west of the meridian will always be in houses 4-9.
- A planet exactly rising anywhere along the eastern horizon will always beon the boundary line between houses 12 and 1.
- A planet exactly setting anywhere along the western horizon will always beon the boundary line between houses 6 and 7.
- A planet transiting the meridian above the horizon will always be on theboundary line between houses 9 and 10.
- A planet transiting the meridian below the horizon will always be on theboundary line between houses 3 and 4.
Chart Spheres
An example chart sphere.
Left: Chart sphere with classic 2Dhouses. Right: Chart sphere with accurate 3D houses.
Left: Campanus houses in classic 2D wheel. Right: Campanus house boundaries on celestial sphere.
House Focused Wheel Charts
Can a standard 2D wheel chart be better at taking into accountplanetary latitude? The answer is yes, if it is displayed in an alternativefashion.
Standard wheel charts are 'sign focused', which meansthat a planet is plotted within the wheel based only on its sign position orzodiac longitude, and its latitude is ignored. Wheel charts can instead be'house focused', which means that the graphical position of where aplanet is placed around the wheel will be its proportion through the 3D house.(In other words, the planet's proportion through the 3D house or percentageacross the prime vertical on the local horizon, will be used to position theplanet between the two appropriate house cusps on the wheel.) The result willcause planets to seem to move, or even seem to be in a different sign (howeverthey will always be in the right house). That's the reverse of a standard'sign focused' wheel which will always position planets in the rightsign (however they may be in the wrong 3D house). If one wants a graphicaldisplay accurate for both zodiac sign positions and 3D house positions at thesame time, then they should use a chart sphere.
See below for an example of 'sign focused' and'house focused' wheels displayed side by size. On the left is astandard 'sign focused' wheel. The correct zodiac position of eachplanet is indicated by the planet's positioning within the surrounding ring ofsigns. Similarly, the standard house position of each planet is indicated bythe planet's positioning within the surrounding ring of houses. However, sincethe wheel doesn't do anything with planetary latitude, the apparent house maynot be the correct 3D house. On the right is a 'house focused' wheel.The correct 3D house position of each planet is indicated by the planet'spositioning within the surrounding ring of houses. However, the sign positionof each planet isn't necessarily the positioning within the surrounding ring ofsigns. Notice how planets are positioned differently in the two wheels, usuallysubtly but sometimes significantly, especially for the fixed stars Sirius andPolaris.
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Left: Standard 'sign focused'wheel. Right: Alternative 'house focused' wheel.
Note if the house system is Campanus, than switching between'sign focused' and 'house focused' for a wheel chart willresult in objects like the Sun and lunar Nodes not moving at all. That'sbecause those objects are on the ecliptic (i.e. at 0 latitude) and Campanushouses and 3D houses have the same cusp points for objects on the ecliptic.
In Astrolog, if you turn on the '3D Houses' setting,then its standard wheel chart will be displayed 'house focused'instead of 'sign focused'.