The Culture Diff' softwares

The Culture Diff' softwares have been developed on the basis of programs conceived during my doctoral thesis devoted to Egyptian ArchaeoAstronomy. A unique feature of these softwares is that they combine several algorithms of astrometry - relating to the positioning of stars on the celestial vault - and of photometry - linked with the brightness of the object sighted, the luminosity of the sky, local weather conditions and the visual acuity of the observer. As a consequence, they allow to accurately determine the time and place (azimuth and height) at which a celestial object appears/disappears on/from the local celestial vault - in dark night, at dawn or at dusk.
Astronomy softwares
To date, three astronomy softwares are at your disposal:
  • a software leading to determine the days of heliacal rising and setting of any star visible with the naked eye,
  • a software leading to determine the days of solstices and equinoxes in any place of terrestrial longitude,
  • a software leading to determine the astronomical source of orientation of any monument erected since 4712 BC.
The access, for an indefinite period, to the user interface of these regularly updated softwares, is available for a fee : 15 euros, 7,50 euros and 35 euros respectively. But free tests of these softwares are at your disposal within the Client Area.

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Save 15 % ! The pack of three astronomy softwares is available at a preferential rate of 40,00 € (instead of 47,50 €) !

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point Days of heliacal setting and rising of a star

The celestial vault is dotted with thousands of stars visible to the naked eye. Some of them can be sighted throughout the year, whereas others remain unvisible - for a northern hemisphere observer, these are the stars which fill the northern and southern circumpolar areas of the sky respectively. These stars never disappear nor appear from/on the local celestial vault. The other stars, located between the northern and southern circumpolar areas of the sky, however rise and set, sometimes at dawn, or in the night sky, other times at dusk. The last day a star disappears in the twilight glow corresponds to its day of heliacal setting. On its day of heliacal rising, the star reappears at dawn, after remaining unseen for days, weeks, even months.

This original software invites you to easily determine the heliacal setting and rising dates of these stars. More details ...
The star of Sirius and the Orion constellation in the twilight glow

The star of Sirius and the Orion constellation in the twilight glow.

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point Days of solstices and equinoxes

The spring and autumn equinoxes, the summer and winter solstices, give rhythm to the year - or rather to the seasons of the year. On these peculiar days, the Sun culminates to higher or lower heights, which give rise to days of varying length ... and to a more or less important ambient light.

This software invites you to easily and quickly determine these four key dates. More details ...
Rising of the spring Sun over the Black Mountain

Rising of the spring Sun over the Black Mountain.

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point Astronomical source of orientation of a monument

Almost every historical monuments have a particular astronomical orientation : sometimes solar, often stellar. Objective : to meet certain worship (megaliths, pyramids, churchs, etc) or cultural (castles) imperatives.

This software invites you to determine the astronomical source of orientation of the monument of your choice. More details ...
Shooting stars on the castle of Penne

Shooting stars on the castle of Penne.

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Save 15 % ! The pack of three astronomy softwares is available at a preferential rate of 40,00 € (instead of 47,50 €) !

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