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I need to find the speculum for a natal chart, do you know how I can find this feature in kairon? Thanks

can you be more specific?

The Speculum (From the common Latin word for Mirror) is simply a list of the Sidereal Times passing over the Midheaven, when the planets or stars rise, culminate,set and anti-culminate. It is an expression of the diurnal rotation of the sphere. That is, the rotation of the earth on its axis. When a planet has an RAMC for crossing an angle,that is the same or nearly the same as that of the moment, the planet is on the reference angle. A planet is on the MC, when its Right Ascension is the same as the local Sidereal time. Likewise, when the the Right Ascension of a planet has exactly 12 hrs difference from the local Sidereal Time, that planet is on the lower meridian or IC. The RAMC for a plant or star rising or setting will depend on the declination of the body and the latitude of the location. The difference between rising/setting and MC/IC is exactly 90 degrees (6 hours of Sidereal time) only at the exact equator. This difference is knows as the semi-arch. As one moves either North or South of the geographic equator, the semi-arch will vary as the ascensional difference (AD) this is given by the simple trig expression sin AD= tan d x tan g. Where d is the declination of the body, and g the latitude of the observer. Then Semi-arc = 90 + AD/15=HMS. If the AD is positive (+), it is added to 90 degrees, but if negative (-), it is subtracted from 90 degrees. The RA of a body represents the Local Sidereal Time for its culmination. As a body must first rise before it can culminate RAMC rising = RA - semi-arc. Likewise, a planet must set before it can anti-culminate. therefore the RAMC setting = RA + semi-arc. Together, these four values, make up the list, known as the speculum.

ok, well, you can't find that in Kairon (yet)
but thank you for the detailled description!

Hi CelestialStarFire,

try following astro software Morinus on Mac, http://astro-morinus.blogspot.com/ . Speculum is part of this software.

Regards

Vaclav