Not only the WEEKDAY and the MOONPHASE are shown correctly for any HISTORICAL and FUTURE DAY, for any TIME and for any PLACE IN THE WORLD, but also shown in clear graphics are the SUN- and MOON- POSITION, the astrological SIGNS OF THE ZODIAC including ASCENDENTS and HOUSES, as well as the actual astronomical CONSTELLATIONS.
Moreover, the RISINGTIMES and the SETTINGTIMES of the sun and the moon, and even the TWILIGHT-TIMES are calculated for any chosen place. Additionally, it will be reminded of certain DATES that are stored in the anniversary list. Handy hints reveal SHADELENGTH and HEIGHTCALCULATION. The calculation of TIMESPANS is not missing.
Surely the Millenniumuhr offers the option to easily set the system time of the computer and even to synchronize it with the radio controlled clock. After all, the time is the pounding heart of the MILLENNIUM-UHR and, besides the important data of the places, the calculation base for this mathematically extremely demanding yet very easy to use program.
SUN-, MOON-, EARTHSCHEME
The digital CLOCK in the middle schematizes the chosen PLACE with the points of the compass. At sunrise the symbol of the sun rises on the left in the East. At midday the sun-symbol can be seen on the top and it goes down on the right in the West. The same scheme is used for the moon.
- On the left there is the dataplate for the chosen place. It reveals the Day-, Rising-, and Setting-Times. If an event is highlighted by a gray box this does mean that it will take place in the early morning of the next day. To make it even clearer the time is written as 24 or 25 (cp. picture).
ASTROLOGY
On the left of and below the Sun-Moon-Clock the Signs of the Zodiac can be seen, which at the moment belong to the sun and the moon. Below that there is the Chinese Year Sign with the following information: 
<--- Change with the key [s] --->
By the way, the Zodiac is supposed to originate from Egypt and not from the Greek. The original meaning of the Zodiac is believed to be: "Division for the Work". The ancient Egyptians conformed in particular to the stars at work, which they could always see clearly in the evening and the morning. On a hot day they rather worked during the cool small hours anyways.
In the ancient Egyptian the syllable "Zo" or "Za" means "for", "dia" or "diaia" means "work", and "kos" means "a part" or the "division"; thus, Zodiac does mean Za diaia kos (also kose) does literally mean: For the work the division, or: Division of the work. That the zodiac cannot have its origin in the Greek can also be seen by the fact that the zodiac of the signs does include human beings (Gemini, Aquarius, Virgo) as well as materials (Libra).
If place and time is unknown, it is at least possible to find out the sun sign, the moon sign and the Chinese Year sign. It is only necessary to be attentive in the transitional periods. The moon for example can possibly be in Fish in the morning, in Aries in the evening. For the purpose of a check just type in different daytimes, such as 00:00 and 23.59 o'clock.
An analysis should always be made intuitively, since there is neither a "good" nor a "bad" sign. There is copious literature and as a rule it deals with more or less good individual interpretations following good older opera. But none is without wohl ganz frei von Eigenfärbung.
PHASES OF THE MOON
On the bottom left there is the Scheme of the moonphases. The first column represents the moon age. A yellow arrow beneath the dotted line indicates the current phase of the moon. The funnel within the full moon symbolizes whether the moon approaches or moves away from earth.
If the moon is seen on the peak of the moonscheme it is apogean or has reached its apogeum.
If the moon appears on the bottom it has reached its perigee and appears accordingly big on the sky.
If the funnel in the full moon shows to the top then the moon moves away from earth, elsewise it approaches. - the changes can easily be seen by scrolling the days by pressing the key [+] or [-].
NEWS
a) Your personal Countdown : If you entered a date ("Day X") (Settings --> Countdown), the period of time between the current date and the entered date is written in the upper right corner after every start of the program. Do not abbreviate the year date, e.g. you should only write 99 if you mean the year 99. The years 1999 and 99 are not the same.
b) According to the dataplate on the left a hint appears 60 minutes before an event occurs.
c) In the bar on the bottom the current and maximal altitude of the sun and the moon are shown as well as the so-called SHADE FACTOR during the day. This factor represents the ratio shade length / height of the object. (Height of an object = Shade length/FACTOR) Dividing the shade length by this factor the height of an object (e.g. of a tower) can be determined. When under way only the place, time, and shade length need to be noticed. At home on the PC it is then possible to divide the shade length by the displayed factor to determine the height.
d) MEMORY, preview of birthdays; all important anniversaries that approach within the next two weeks are listed in the table on the bottom right.
A few birthdays are already stored in the list of anniversaries. This list can be edited in the settings - where you for example have the opportunity to add the for you important anniversaries.
HOTKEYS
Many options can be chosen by pressing a key or by using the mouse. The following hotkeys are available:
[-] = To set the previous day; a maximum of 2 million days is possible. [o] = PLACES; do you want to know when the moon rises in the holiday resort or what time it is in Rio de Janeiro at the moment, then press this key. It is possible to freely edit the list of places. [*] = To set the home location;thus, to set the place that is automatically shown when the program is started (normally the home location). [s] = The signs of the zodiac are shown, but the real constellations behind the sun and the moon are revealed by this key. [1] = CIVIL twilight: At what time or until when will it be bright enough to be able to read outside ? The times of twilight are marked as gray areas and minutely exact displayed in the dataplate on the left. [2] = NAUTICAL twilight: Until when it is possible to recognize the horizon for the purpose of better orientation ? [3] = ASTRONOMICAL twilight: Stars of magnitude 5 can be observed. To the north of Nürnberg there are the so-called "Hellen Nächte" in June, which means that there is no astronomical night at that time. Wrong inputs of dates Do not be surprised that there is no year 'zero'. It is a fact, which is widely unknown: There was no year 'zero'. Thus, the third millennium actually began on 1.1.2001. At that point of time exactly 2000 years were up.
The Millenniumuhr Calendar is scientifically validated. The weekdays B.C. and A.D. are computed correctly. For example, the 1.1. of the year 1 of our time is in fact calculated to be a Saturday and the antecedent Friday the 31.12.-1 (cp. below)! You can read more about calendar knowledge under Kalenderwissen -
If the time or the date is incorrect then the PC-clock is wrong and should be set correctly, which can be done at the settings. Also, coordinates of the place and the corresponding time zone have to be checked.
The rising and setting time are defined as the time at which the upper edge of the sun or the moon meets the horizon. Precision for the sun +/-1 minute, for the moon ca. 5 minutes. Most of the time, mountains and clouds make the visibility poor and thus make it difficult to observe the mathematically calculated point of the plane. The twilight times though, are always well comprehensible. - the handled timespan is for all that more than 8000 years ! Deviations Gregor
XIII. (1502-1585), until 1572 Ugo Boncompagni, Pope (1572-1585), carried through a for a long time overdue calendar reform, because the Julian Calendar used at that time differed obviously from the seasons. After a longer scientific preparation the Pope decreed the reform of the calendar and set the beginning: Thursday, the 4th October in 1582 was followed by Friday, the 15th October in 1582, wherewith the by the time added up error of the Julian Calendar was patched. Nowadays the whole world conforms to this Gregorian calendar system. - But at that time there was an organizational problem:
Not all the countries took part immediately in this Gregorian calendar, especially not the Protestant countries. The Protestant parts of Germany and the Netherlands as well as Switzerland, and Denmark accepted this reform only in the year 1700. There, February, the 18th 1700 was followed by March, the 1st 1700.
Greatbritain adopted this reform in 1752: September, the 2nd was followed by September, the 14th. In Sweden February, the 17th 1753 was followed by March, the 1st 1753.
Russia followed after the October revolution, whereas the October revolution in Gregorian calendar was in November. This is why the October revolution is nowadays celebrated in November. The last country adopting an own variant of the Gregorian calendar was Greek in 1923.
These special cases are not factored in in this calendar program. Globally seen only the version of the Millenniumuhr is correct, because the Millenniumuhr exactly complies with the Gregorian regulation: Thursday, the 4th October 1582 is followed by Friday, the 15th October 1582. Country-specific deviations in the critical period of transition have to be known and considered by historians
Many further reviewable data can be found in the very interesting essay Kalender und Chronologie, Bekanntes & Unbekanntes der Kalenderwissenschaft by Prof. Heinz Zemanek, Technical University Wien (IBM Fellow), Oldenbourg Verlag The MILLENNIUMUHR proffers still much more. Not everything can be described here. It works every second and updates the graphics all the time. Each picture is unique, logically ! - The sun and the moon are wandering. Numbers, words, and colors are changing. Much has been considered. Nevertheless, it is possible that some bugs appear. Though, the reason of inaccurate data often lies in an incorrect setting of the PC-clock or in improper coordinates, time zones, or years ("50" instead of "1950").
Thank you very much and take much pleasure in the Millenniumuhr !
[t] or [u] = To set another day and/or month and/or year and/or time within the program. If you change the year, please notice that 98 ist different from 1998. The available timespan reaches from the year -4200 to +4200. 
[+] = To set the next day, relatively to the shown date.
Wrong inputs of dates are automatically changed to valid dates, as a rule to the nearest possible dates. Example: If you type in the date 30.2., this input will be changed to March, the 1st or March, the 2nd - depends on whether or not the entered year is a leap year.
PRECISION
Literature to Calendar data