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Circle on the celestial sphere parallel to the horizon
An almucantar (also spelled almucantarat or almacantara) is a circle on the celestial sphere parallel to the horizon. Two stars that lie on the same almucantar
Almucantar
Astronomical instrument
horizontal cross-hairs which plots locations on an azimuthal ring called an almucantar (altitude-distance circle). An arm called a radius connects from the center
Astrolabe
Navigational instrument
The transom can be moved on the staff and used to measure angles. The Almucantar staff is a device specifically used for measuring the altitude of the
Backstaff
Network of ground-based sun photometers
products in diverse aerosol regimes. Inversion products are retrieved from almucantar scans of radiance as a function of scattering angle and include products
AERONET
Medieval Arab astrologer
Shadow square Sundial Schema for horizontal sundials Triquetrum Concepts Almucantar Apogee Astrology Astrophysics Axial tilt Azimuth Celestial mechanics Celestial
Abu_Ali_al-Khayyat
Ottoman astronomer and timekeeper
(or rubu tahtası in Ottoman Turkish, translated into English as the "almucantar quadrant" or the "astrolabe quadrant"). In the early Ottoman astronomy
Muhammad_al-Qunawi
problems. The horary quadrant, for finding the time of day with the sun. The almucantar quadrant, which was developed from the astrolabe. Planetary equatoria
Astronomy in the medieval Islamic world
Astronomy_in_the_medieval_Islamic_world
Navigation instrument
1300, and is in the local Stedelijk Museum in Zutphen. The astrolabe/almucantar quadrant – a quadrant developed from the astrolabe: This quadrant was
Quadrant_(instrument)
Real line of position in celestial navigation
illumination or terminator (star = Sun, Ho = 0 for places at Sunrise/Sunset). Almucantar Navigation Celestial navigation Intercept method Longitude by chronometer
Circle_of_equal_altitude
Military unit
Theodolite Kern DKM3-A with an impersonal micrometer and Horrebow bubble for Almucantar longitude and latitude for 1st Order/Laplace astro-geodetic surveys –
8th_Field_Survey_Squadron
German engineer, author, printer, priest and astronomer
astrolabes for the 39° latitude plate were found to be inaccurate, having the almucantars spaced out too far. Of the four astrolabes in that production run, all
Georg_Hartmann
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