Frequently asked questions

1st) How long is a week in the French revolution calendar?

In the French revolution calendar the year is divided into 12 months (in each case 30 days). The months are divided in 3 decades to 10 days each:

 1st day: Primidi
 2nd day: Duodi
 3rd day: Tridi
 4th day: Quartidi
 5th day: Quintidi
 6th day: Sextidi
 7th day: Septidi
 8th day: Octidi
 9th day: Nonidi
10th day: Decadi
   

2nd) Which month in the French revolution calendar is the shortest month?

In the French revolution calendar with is divided into 12 months to 30 days each. At the end of the last monthly (Fructidor) 5 or in the leap year 6 transition days (Sancculottiden) are added. The Sancculottiden was holidays and they were not assigned to other month. They were also not counted as an independent month (13th month). There is therefore in the French revolution calendar no month, which is shorter than 30 days.

3rd) How long is a week in the Egyptian calendar?

In the Egyptian calendar the year is divided into 12 months to ever 30 days. The months are divided in 3 each "large weeks" to 10 days each or in 6 "small weeks" to 5 days each.

4th) How much are there seasons in the Egyptian calendar?

Im ägyptischen Kalender werden 3 Jahreszeiten unterschieden:

Achet   (Time of the inundation): 1st Thot   - 30th Choiak
Peret   (Time of the sowing):     1st Tybi   - 30th Pharmuthi
Schemut (Time of the harvest):    1st Pachon - 30th. Mesori
   

5th) How much are there seasons today?

The year is divided in 4 seasons (winters, spring, summer and autumn). The at the beginning of the seasons defined by the equinox and solstice. The seasons turned around on the north and southern hemisphere.


Winter-solstice: 21st/22nd December
Spring-equinox:  20th/21st March
Summer-solstice:      21st June
Autumn-equinox:  22nd/23rd September
   
Northern hemisphere:
Winter beginning begins with the winter-solstice at 21st/22nd December
Spring beginning begins with the spring-equinox at 20th/21st March
Summer beginning begins with the summer-solstice at 21st June
Autumn beginning begins with the autumn-equinox at 22nd/23rd September

Southern hemisphere:
Winter beginning begins with the summer-solstice at 21st June
Spring beginning begins with the autumn-equinox at 22nd/23rd September
Summer beginning begins with the winter-solstice at 21st/22nd December
Autumn beginning begins with the spring-equinox at 20th/21st March
   

6th) Which month in the Egyptian calendar is the shortest month?

In the Egyptian calendar with is divided into 12 months to 30 days each. At the end of the last monthly (Mesori) 5 additional days (Epagomenen) are added. The Epagomenen was not assigned to a month and they were also not counted as an independent month (13th month). They were considered as birthdays of the Egyptian Gods. There is therefore in the Egyptian calendar no month, which is shorter than 30 days.

7th) How much do months in the Gregorian calendar have 30 days?

The months April, June, September and November have 30 days each. The month February has 28 days or 29 days (in the leap year) and the remaining months (January, March, May, July, August, October and December) have 31 days each.

8th) Which is the shortest month in the Gregorian calendar?

The month February has 28 days in a normal year and in a leap year 29 days. The month is despite the additional intercalary day the shortest month in the Gregorian calendar. All other months have between 30 and 31 days.

9th) When is a leap year in the Gregorian calendar?

In the Gregorian calendar every 4 and 400 years are a leap year. If the year is however divisible by 100 without remainder, then this year is not a leap year.

10th) What happened in Rome between 4th and 15th October 1582 o.c.?

Nothing, because this period did not give it in Rome. The ten days between them did not take place. The 5th to 14th October was painted simply from the calendar, in order to repair the agreement of the seasons with the calendar.

11th) In the which year was the Gregorian calendar introduced?

In the year 1577 o.c. he assigned a Roman commission the reform of the Julian calendar, which had decided the council of Trient. On 24th February 1582 o.c. pope Gregory XIII published the results of the commission in the bull "Inter gravissimas" and introduced he the new Gregorian calendar at the same time.

12th) At which time each day is the red "time ball" of the Greenwich Observatory dropped?

In the year 1833 on the roof of the Greenwich of observatory a red "time ball" was installed. Since 1833 this "time ball" daily always falls at 13. It falls at 13.00 o'clock, because the astronomers were busy with the midday sun with their telescopes. This tradition is maintained today in favor of the tourists.

The time ball

13th) How is the Islamic chamfering month called?

The month Ramadan is the 9th month in the Islamic calendar and is the Islamic chamfering month. In this period during the day (between dawn and sun fall) the admission of solid and liquid food, drinking water, is to which sexual intercourse and also smoking forbade. Further it is the Muslims in this period does not permit controversy with its fellow men to begin to lie laestern etc.

By this requirement some persons are released:

- children under 15 years
- old humans
- ill humans
- humans mentally handicapped
- woman in childbed
- pregnant woman
- satisfying mothers
- women in the Mestruation
- and similar person's groups
   

Persons, whose health situation will not improve presumably (e.g. chronically patient or ageweak), are to feed missed day a needy one for everyone in the chamfering month. Other persons, whose health situation will improve (e.g. pregnant woman, satisfying mothers etc.), are to get the missed chamfering days at a later time after.

The definition for the beginning and end of the chamfering monthly Ramadan depends with some Islamic right schools not only on the astronomical computation, but also on the actual sifting of the new moon. The consequence is that not all Muslim begin and terminate the Ramadan exactly at the same time. Geographical and weather-conditioned conditions can cause that the definition varies world-wide seen around one, sometimes by 2 days.

14th) Who put the today valid calendar into effect?

The today valid calendar (Gregorian calendars) was introduced by Pope Gregor XIII. On 24th February 1582 o.c. pope Gregory XIII published the results of the commission in the bull "Inter gravissimas" and introduced he the new Gregorian calendar at the same time.

15th) How much are there time zones?

If the doubly designated time zones are not taken in account, then there are altogether 30 different time zones.

Die Zeitzonen

Abbreviation   Full name                          Time zone     
Y              Yankee Time Zone                   UTC - 12 hours

X              X-ray Time Zone                    UTC - 11 hours

HAST           Hawaii-Aleutian Standard Time      UTC - 10 hours
W              Whiskey Time Zone                  UTC - 10 hours

AKST           Alaska Standard Time               UTC -  9 hours
HNY            Heure Normale du Yukon             UTC -  9 hours
HADT           Hawaii-Aleutian Daylight Time      UTC -  9 hours
V              Victor Time Zone                   UTC -  9 hours

AKDT           Alaska Daylight Time               UTC -  8 hours
HAY            Heure Avancée du Yukon             UTC -  8 hours
HNP            Heure Normale du Pacifique         UTC -  8 hours
U              Uniform Time Zone                  UTC -  8 hours
PST            Pacific Standard Time              UTC -  8 hours

HAP            Heure Avancée du Pacifique         UTC -  7 hours
HNR            Heure Normale des Rocheuses        UTC -  7 hours
MST            Mountain Standard Time             UTC -  7 hours
PDT            Pacific Daylight Time              UTC -  7 hours
T              Tango Time Zone                    UTC -  7 hours

CST            Central Standard Time              UTC -  6 hours
HAR            Heure Avancée des Rocheuses        UTC -  6 hours
HNC            Heure Normale du Centre            UTC -  6 hours
MDT            Mountain Daylight Time             UTC -  6 hours
S              Sierra Time Zone                   UTC -  6 hours

CDT            Central Daylight Time              UTC -  5 hours
EST            Eastern Standard Time              UTC -  5 hours
HAC            Heure Avancée du Centre            UTC -  5 hours
HNE            Heure Normale de l'Est             UTC -  5 hours
R              Romeo Time Zone                    UTC -  5 hours

AST            Atlantic Standard Time             UTC -  4 hours
EDT            Eastern Daylight Time              UTC -  4 hours
HAE            Heure Avancée de l'Est             UTC -  4 hours
HNA            Heure Normale de l'Atlantique      UTC -  4 hours
Q              Quebec Time Zone                   UTC -  4 hours

HNT            Heure Normale de Terre-Neuve       UTC -  3:30 hours
NST            Newfoundland Standard Time         UTC -  3:30 hours

ADT            Atlantic Daylight Time             UTC -  3 hours
HAA            Heure Avancée de l'Atlantique      UTC -  3 hours
P              Papa Time Zone                     UTC -  3 hours

HAT            Heure Avancée de Terre-Neuve       UTC -  2:30 hours
NDT            Newfoundland Daylight Time         UTC -  2:30 hours

O              Oscar Time Zone                    UTC -  2 hours

N              November Time Zone                 UTC -  1 hour

GMT            Greenwich Mean Time                UTC
UTC            Coordinated Universal Time         UTC
WET            Western European Time              UTC
Z              Zulu Time Zone                     UTC

A              Alpha Time Zone                    UTC +  1 hour
BST            British Summer Time                UTC +  1 hour
CET            Central European Time              UTC +  1 hour
IST            Irish Summer Time                  UTC +  1 hour
MEZ            Mitteleuropäische Zeit             UTC +  1 hour
WEDT           Western European Daylight Time     UTC +  1 hour
WEST           Western European Summer Time       UTC +  1 hour

B              Bravo Time Zone                    UTC +  2 hours
CEDT           Central European Daylight Time     UTC +  2 hours
CEST           Central European Summer Time       UTC +  2 hours
EET            Eastern European Time              UTC +  2 hours
MESZ           Mitteleuropäische Sommerzeit       UTC +  2 hours

C              Charlie Time Zone                  UTC +  3 hours
EEDT           Eastern European Daylight Time     UTC +  3 hours
EEST           Eastern European Summer Time       UTC +  3 hours

D              Delta Time Zone                    UTC +  4 hours

E              Echo Time Zone                     UTC +  5 hours

F              Foxtrot Time Zone                  UTC +  6 hours

CXT            Christmas Island Time              UTC +  7 hours
G              Golf Time Zone                     UTC +  7 hours

AWST           Australian Western Standard Time   UTC +  8 hours
H              Hotel Time Zone                    UTC +  8 hours
WST            Western Standard Time              UTC +  8 hours

I              India Time Zone                    UTC +  9 hours

ACST           Australian Central Standard Time   UTC +  9:30 hours
CST            Central Standard Time              UTC +  9:30 hours

AEST           Australian Eastern Standard Time   UTC + 10 hours
EST            Eastern Standard Time              UTC + 10 hours
K              Kilo Time Zone                     UTC + 10 hours

ACDT           Australian Central Daylight Time   UTC + 10:30 hours
CDT            Central Daylight Time              UTC + 10:30 hours

AEDT           Australian Eastern Daylight Time   UTC + 11 hours
EDT            Eastern Daylight Time              UTC + 11 hours
L              Lima Time Zone                     UTC + 11 hours

NFT            Norfolk (Island) Time              UTC + 11:30 hours

M              Mike Time Zone                     UTC + 12 hours
   

16th) Who developed the formulas for the computation of the Easter date?

The council of Nicaea (325 o.c.) put Easter on first Sunday after the first full moon in spring.

The astronomer and mathematician Carl Friedrich Gauss (1777-1855) set up exactly according to the church regulations the Easter formula. With the help of this formula can be computed, on which date of any yearly Easter sunday falls.

Carl Friedrich Gauss

The Gauss' Easter formula:

a = Rest of (Year / 19)
b = Rest of (Year / 4)
c = Rest of (Year / 7)
d = Rest of ((19 * a) + M / 30)
e = Rest of ((2 * b) + (4 * c) + (6 * d) + N) / 7
   

Then Easter falls on (d + e + 22) March or (d + e - 9) April.

For the variables M and N the following numbers are to be used:

Year                M          N
1583-1599          22          2
1600-1699          22          2
1700-1799          23          3
1800-1899          23          4
1900-1999          24          5
2000-2099          24          5
2100-2199          24          6
2200-2299          25          0
2300-2399          26          1
2400-2499          25          1
   

Exceptions:
The Easter sunday always moves in the period of 22nd March until 25th April. If the computations result in 26th April, then for it 19th April is to be always used. Likewise at 25th April always 18th April is used, if a is larger than 10 and d equal to 28.

With the Easter Sunday other celebrations are connected, therefore these celebrations are called mobile celebrations.

List of the mobile celebrations:

Celebration        Easter Sunday    Period                    
Shrove Tuesday     47 days before   03rd February - 09th March
                                    04th February - 10th March
                                    (in the leap year)
Ash Wednesday      46 days before   04th February - 10th March
                                    05th February - 11th March
                                    (in the leap year)
Maundy Thursday    3 days before    19th March    - 22nd April
Good Friday        2 days before    20th March    - 23rd April
Easter Sunday                       22nd March    - 25th April
Easter Monday      1 day after      23rd March    - 26th April
Ascension Day     39 days after     30th April    - 24th May
Whit Sunday       49 days after     10th May      - 03rd June
Whit Monday       50 days after     11th May      - 04th June
Corpus Christi    60 days after     21st May      - 14th June
   


A call to the visitors!!!

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