Horizontal coordinate system - see where planets are in the sky right now relative to your horizon.
Horizontal (azimuthal) chart in observer coordinates: - Circular chart: center is zenith, outer circle is horizon - Azimuth: 0°=North, 90°=East, 180°=South, 270°=West - Altitude: 0°=horizon, +90°=zenith - Planets above horizon are visible, below are invisible - 4 cardinal points and intermediates (NE, SE, SW, NW) - Concentric circles: 0°, 30°, 60° altitude - Planet glyphs at corresponding positions - Meridian line (N-S) and horizon line - Table: Planet | Azimuth | Altitude | Above Horizon - Export to PNG
The horizontal chart shows the sky as seen by a person at the birthplace: not by zodiacal longitude, but by azimuth and altitude. The center of the circle is the zenith, the outer circle is the horizon line.
Azimuth is measured from north clockwise: 90 degrees is east, 180 south, 270 west. Altitude shows how far the planet is above the horizon, and a planet with negative altitude at the moment of birth was below the ground.
It is immediately clear which planets were actually above the horizon and which were not. The zodiacal chart does not show this: a planet in the tenth house can be invisible, while a planet near the ascendant can be high above the horizon.
This view is useful in work with fixed stars and in astrometeorology, where the visibility of the celestial body is crucial, as well as everywhere where astrological logic relies on the actual appearance of the sky rather than on a projection.
Most often, it is addressed in work with fixed stars: in the tradition, it is significant whether the star rose together with the planet and whether it was visible above the horizon. With zodiacal longitude, this question is not resolved, azimuth and altitude are needed.
The second case is checking one's intuition about the chart. Seeing that Saturn was almost at the zenith at the moment of birth, and Venus was deep below the horizon, the astrologer receives an additional argument about which planet in the chart is louder.
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