This software calculates accurate dates and times for equinoxes, solstices and the Celtic cross-quarter days (Imbolc, Beltane, Lughnassad and Samhain). The cross-quarter days are those midway between the equinoxes and solstices. For example, Imbolc is midway between the northern winter solstice and the northern spring equinox (a.k.a. the northern vernal equinox), and Beltane is midway between the northern spring equinox and the northern summer solstice. When we attempt to define the cross-quarter days more exactly we find that there are two interpretations, and thus two methods of calculation, which give slightly different results. These two methods are called the 'mean sun' method and the 'true sun' method. The mean sun method assumes (erroneously) that the Earth moves at a constant speed in a circular orbit around the Sun. The true sun method calculates a cross-quarter day based on the time at which the Earth reaches that point in its orbit which is spatially (geometrically) exactly halfway between its positions at the solstice (or equinox) and the subsequent equinox (or solstice).
» version 5.22 - posted on 2015-12-25
Relaxed trial version restriction
» version 3.33 - posted on 2009-09-11
EULA - End User License Agreement
Hermetic Systems is the business name of Peter Meyer, firstname.lastname@example.org, the developer of this software, and the owner and maintainer of the Hermetic Systems website at hermetic.ch.
The Equinoxes, Solstices and Cross-Quarter Days software ("the Software") consists of the executable file and the other files installed by the installation program eqsol_setup.exe obtainable from the Hermetic Systems website.
The Software is protected by copyright, which is owned by Hermetic Systems. The Software may be downloaded from the Hermetic Systems website or another authorized download site solely for the purpose of its evaluation with regard to the purchase of a user license. Neither the installation program nor any work derived from it may be distributed further by any means (including via CD or the web) without the permission of the copyright holder.
All intellectual property rights related to the Software are owned by Hermetic Systems. You may not rent or lease the Software. You may not modify, translate, reverse engineer, decompile or disassemble the Software or any part thereof or otherwise attempt to derive source code or create derivative works therefrom. You may not remove, alter or destroy any proprietary, trademark or copyright markings or notices contained within the Software. You may not sell or offer for sale any derivative work. Any rights not explicitly granted by Hermetic Systems are reserved.
In return for a license fee paid to Hermetic Systems or to one of its authorized representatives or resellers you are granted a license to use the Software in its fully-functional form and you are provided with activation keys for each installation of the Software as follows:
(A) If you are a natural person then you receive a single-user license and this entitles you to install, activate and use the Software on a reasonable number of personal computers (e.g., a laptop and a desktop) in your private household or office.
(B) If you are an entity other than a natural person (e.g., a corporation) then you are required to purchase a number of single-user licenses equal to the maximum number of persons who will be using the software at any one time.
The function of an activation key is to remove any temporal or functional limitations on a particular installation of the Software. A separate activation key is required for each installation (in other words, an activation key works only on a particular computer).
In the event that a later version of the software is released, you may update an installation at no charge by downloading and installing the new version.
If you change your computer (or make a major hardware modification) you may need to obtain a new activation key. This can be obtained in the same way as before (and at no charge), provided that, in the opinion of Hermetic Systems, the number and frequency of such new activation keys is not unreasonably excessive.
Installation of the Software constitutes an agreement that the Software is provided "as is", without any warranties or guarantees. Hermetic Systems makes every effort to ensure that the software is error-free and performs as stated in the online user manual, but does not guarantee this. You assume responsibility for selecting the Software and using it for your intended purposes. In no event shall Hermetic Systems, its resellers or distributors of the Software be liable for any any damages whatsoever arising out of use or inability to use the Software, even if advised of the possibiity of such damages.
Tell us your experience with Equinoxes, Solstices and Cross-Quarter Days5.22
RELATED PROGRAMS Our Recommendations
Moon Calendar Plus TRIAL Moon calendar: - Lunar days, the start and end of lunar day; - Solar and lunar eclipses for any year (a type of eclipse, date and time of eclipses); - Characteristics of lunar days; - The moon's age, the time of sunrise - sunset, moonrise - moonset; - Sign of the zodiac for the Sun and the Moon... Download
Sunset and Sunrise TRIAL Live by the Sun! See not only the Sunrise and Sunset times but also the First and Last Light times for exactly where YOU are right now not the "closest" city. See exactly how much daylight is left in the day - in a large, simple, easy to read display - so you can plan ahead to the last speck of... Download
Sol: Sun Clock – Daylight Forecaster & Solar Alarm Clock TRIAL What time is sunset today? Or sunrise tomorrow? When is the "magic hour" next March 20 in Paris? With Sol, you can check times and get reminders of solar events, at home or while traveling! Great for everyone looking to plan activities based on sunlight. Use it to remind you to walk the dog... Download