** Version 1.3.6 CHANGELOG

(1) – DeltaT calibration point CP46 has been updated according to the following article published by Morrison, Stephenson, Honenkerk and Zavilski.

“Total solar eclipse of AD 1133 and ΔT” – JHA 2023 – Vol. 54(4) 469-480

DOI: 10.1177/00218286231209030

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(2) – UrukFSP Star Catalogue updated to version “J”. Radial velocity of about 4800 Hipparcos Stars has been updated using the Vizier archive_table I345_rvstdcat. The related paper is:

Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project – (J. H. J. de Bruijne and A.-C. Eilers 2012)

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(3) – The appearance of the bottom Status Bar has been slightly modified.

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(4) – EQT View and HOR View: the color of the symbols of planets has been turned to orange because it was too similar to planetary nebula’s color.

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(5) – HOR View : when magnification is greater than 10x, horizon names are shown, with the amount of the dipped horizon value.

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(6) – EQT / HOR / ASM Views: now Milky Way has a transparent fill. The switch concerning the Horizontal View is temporarily disabled. New data about the Milky Way are a polygonal representation and I still have some problems with the projection used into the HOR view. A deep analysis of the problem is needed and while working on it I prefer to keep this feature temporarily disabled in the HOR View.

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(7) – Input DATE Form : now the input box of manual DeltaT value reacts to ENTER key to apply changes. This allows a more comfortable procedure in case of search for constraints during a solar eclipse.

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(8) – Star Catalogue Form : search buttons no more exist, now the input boxes react to the ENTER key.

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(9) – New tool: identify never-rising and circumpolar stars at a certain epoch and location. Asking for a solution for several millennia far from contemporary epoch requires very accurate models for precession and computing of stars proper motions, taking into account their radial velocity (if available).

UrukFSP uses respectively:

Precession : Vondrak, Capitaine and Wallace (2011) – max error several arcmins at ±200 millennia from J2000.

Proper Motions (using Rv) : based on IAU SOFA Pmpx except for Roemer Effect 1st order computation.

So, as an example, we can compute when the star Sirius disappears from the sky (referred to the astronomical horizon) at Gobekli Tepe. For each star up to Vmag 4.0 the tool reports the Inferior and Superior Culmination, so its behaviour can be easily checked out. Of course this date could be influenced by the local horizon profile (it’s not the case of GT where the horizon at South is flat) so a further check is always needed.

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10) Date Input Form – added two button moving manual DeltaT ± 50s. This makes easier and quicker searching for constraints of the totality (or annularity) path on a specific location.

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11) Info Menu – added two new charts about long term algorithms computing the Eccentricity of the Earth and the Inclination of the Ecliptic. They have a time range of ± 200 millennia and ± 1 million years respectively and are used internally in UrukFSP for computing several tasks.

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12) The consultation of the stellar catalog is now always active, regardless of whether the stars are activated or not.

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13) The button “Track Constellation” was added in the Main Form.

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14) Main Form : removed buttons [1′] and [1″] because basically useless.

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15) Main Form : The clickable upright box containing the date contains now the Gregorian Proleptic Date as well.

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16) Added into the General Ephemeris the distance of current date from equinoxes and solstices expressed in days.

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17) DeltaT shown by the status bar is now represented with a hh:mm:ss format, and in case with days.

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18) Added to the general options the values of Pressure and Temperature to obtain a fine tuning of refraction.

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19) Added to the general options a new switch allowing the Application to navigate from 100000 BCE to 100000 CE. JPL DE Ephemerides will be deactivated and every menu or window related to planets, comets and asteroids won’t be accessible. The only reason for using this feature is to explore precession effects shown by the stars, being the Vondrak 2011 model adequate for this computation.

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NOTE : if you already have an earlier version of UrukFSP the new location file will not overwrite your local file contained into UrukFSP_USR/Locations. If you want the new file to be installed you have to rename the one already present into the above path. Location files are plain text files, so if you added a lot of new locations in your renamed file they can be transferred via copy and paste.

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NOTE : Unlike most programs, in UrukFSP moving in the EQT, HOR and STEREOGRAPHIC EARTH VIEW windows doesn’t require holding down the left mouse button and dragging it to the destination. Simply click the left mouse button on the new position that needs to be placed at the center of the window. Alternatively, it is possible to rotate the current window by moving the mouse over the boxes indicating AR, DEC, ALT, AZM, LON, LAT if enabled, and acting on the mouse wheel. This can be done in steps of 10°, 1°, 1′, 1″.

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