(old and new)
If you need some help, please, send me a message.
Some of the items are taken from my
old web page
(2002), University of Zimbabwe in Harare.
Happy New Year 2019 !!!
My paper for the
magazine (with easy explanations) (HTML format)
A calendar table (DOS text format)
Calendar formulae (DOS text format) (or a PDF suitable for printing)
Whole year face (compact) or
zip (Excel format) *
(A Swedish firm used this construction for advertisment - see
Whole year face (all months fully shown)
(see a picture) (Excel format) *
One month face or
zip (Excel format) *
* - These three calendar constructions are with internal
sliding part and you will have to print, cut, and glue their two parts.
Table 1 (73 KB) or
zip (13 KB) (Excel format)
Table 2 (28 KB) or
zip (7 KB) (Excel format)
Universal calendar - Excel or
Plain TEX format
An "exotic" minimized variant of the previous calendar
It is more complicated in use since at one place are gathered the dates
in the month, the years in the century, and the full centuries old style.
This forces using colors and more steps which are not so obvious. Therefore, if you need some help
with the graphically presented algorithm, please, contact me via the above e-mail addresses.
I made this calendar after I accidentally spotted a
calendar at Al Stanger's page and I decided to improve it with the possibility a whole
month calendar to be seen at once instead of finding the day of week for a single date only.
(Plain TEX format) - unzip in a separate directory. You can
run two .bat files and view other two .dvi files.
Other calendar variants and experiments
(in bulk - zip) (DOS, Excel, Basic)
There are many web pages related to calendars, but I decided to give here
only one link as a suitable starting point for calendars:
All possible year tables
on one folded sheet for your pocket (PDF-A4 variant as
design). The week in it starts on Monday and each row contains 3 months.
There is also a PDF-Letter variant. The Excel source contains all four variants without
PocketMod on one sheet - 1) the week could start on Sunday or Monday and
2) the rows could have 3 or 4 months. If you want to make a PocketMod
booklet, you have to prepare first a pre-PocketMod worksheet with 8
pages as the second worksheet in the .xls file. Then use printing with
some kind of PDF creator to have a file like this one. The final
step is to use the PDF to PocketMod convertor to produce only one A4
or Letter format sheet for cutting and folding. (Note that
to be able to run "PDFtoPocketMod.exe" you need to download
Microsoft Net Framework !!!)
Using "division by 5.6" with a calculator:
Here some modifications of Al Stanger's algorithms for finding the DayOfWeek
are presented. You can see
his first message in the
of a Calendar Mailing List.
The algorithms use only the decimal part of "division by 5.6".
Explanations can be found in my messages to the same list:
My favorite files for downloading:
DAY ( DDAYYYY/5.6, see some
explanations and an easy way to
memorize the key values), also a variant as
DAY-Box for pens.
Simplified 4-years calendar table - (Excel
variants - card size + 1916-2083 calendars)
he idea from the above table is used for a suitably minimized variant of a perpetual calendar
- (Excel variants - card size + full pages)
A combination of four years calendars for 2012-2039 plus compact 1916-2083 calendar (
PDF variant for printing and Excel variant for editing)
(December 2017) Unusual diagonal construction of a calendar
You can subscribe to the
Sundial Mailig List or at least to visit its
archive with messages.
Quadrant sundial (PostScript format) Find new variants (2017) for DeltaCad at the bottom of the page!!!
Analemma - Equation of Time
vs. Declination of the Sun (PostScript format) - renewed version of my old
file with average data for 2000-2047 (due to Gianni Ferrari).
You can print this data as month tables and also as approximation formulae in
PocketMod variant (explaned in the calendar section above) in two formats:
The files to the end of this section are written as macro files for
DeltaCad (CAD extension of BASIC). You have
to download the program from
There is a DEMO version on it.
One of the active members of the Sundial Mailing List
- Carl Sabanski - put in November 2007 on
his web site a few
pages with existing
DeltaCad macro files related to sundials written by
different people and, in particular,
MY MACRO FILES from this page. You will find screen
shots, instructions, comments and other useful information on these
pages and therefore I highly recommend visiting them !!! I am very grateful
to Carl for our fruitful joint work and for popularizing DeltaCad as a
suitable drawing tool for sundials !!! (Below "CS" indicates links to pages
on Carl Sabanski's site.)
Spider Polar Sundial
helped me to convert this macro to a
real dial. A better view of the dial face is included in
this zip file.
Spider Sundial with
In particular it can be Azimuthal Dial (if the plane is horizontal).
Spider Sundial with
arbitrary plane and arbitrary gnomon - shows local, civil and
daylite savings time. Contains also the previous two types as options.
Spider Polar Square Sundial
Box Folding Sundials
Some of my Box Sundials can be downloaded also from the
DeltaCad web page of
The North American Sundial Society.
Polar Box Sundial
Box Sundial with arbitrary orientation
(read some instructions)
Polar Nodus Box Sundial - you
have to print two dials (one for 21Dec-21Jun and another for 21Jun-21Dec)
Polar Box Sundial with
gnomon - based on the previous dial, but the gnomon allows to use it
during the whole year (one of the ends is used as nodus for 21Dec-21Jun
and the other for 21Jun-21Dec, i.e. the analemma is splitted)
picture the time is approximately 14:30 Daylight Savings Time (DST) on
8 May in the upper part. In the lower part you can see that the position
of the sun will be the same at approximately 14:40 DST on 5 August.
The size of the box is 66 x 81 x 16 mm when printed landscape on A4 paper.
After folding it becomes a rectangle with dimensions only 33 x 81 mm.
Horizontal Box Altitude Sundial
which uses the height (altitude, elevation) of the Sun to show the time
Modification of the Horizontal
Box Altitude Sundial (January 2008) which shows only one month for better
Double Box Altitude Sundial
Another modification of the Horizontal Box Altitude Sundial (January 2008)
with the edge of the middle wall between two adjacent boxes as a gnomon.
The same sundial was modified by Fabio Savian and was included in his
Wee-Meng Lee from Singapore pointed out to an existing
origami box construction which is applicable also to
my box sundials. He also put on
page some of my sundials.
In the end of 2006 I made a DeltaCad macro with improvement of
a design made by Wee-Meng Lee of a
Universal Ring Dial
Now the hour scale can be adjusted for the Longitude and the Equation
Polar Cross Sundial (test variant - April
Sundial with Parallel
Gnomon and arbitrary
position (test variant - May 2007)
Classical Bifilar Sundial with two perpendicular gnomons parallel to the dial plate
and with arbitrary position (test variant - December 2007)
WITH ARBITRARY STRAIGHT GNOMONS AND DIAL PLANE (test variant - December
THIS IS MY NEW YEAR PRESENT TO THE SUNDIAL
Cylinder Sundial (Type 1)
with arbitrary position. A beam of light through a hole at its surface gives
the time inside the cylinder (January 2008)
Cylinder Sundial (Type 2)
with arbitrary position. A beam of light through a concentric hole or a
nodus point at its base gives the time. It can be read from inside the
cylinder or from outside (if the cylinder is transparent). (September 2008)
Flag Combo: Sun Compass and Sundial
Allows to find first the North-South direction and then to read the Local
Time. Longitude and EoT corrections are printed on it. You can download
directly a PDF file with
The Light-Shadow boundary indicates the Civil Time and DST.
Sun Position - Represents hour
and date lines vs. the azimuth and the height of the sun.
Star and Sun Clock for the
Northern Hemisphere - An essential extension of my Star Clock (below)
with the pozition of the sun among the stars (the ecliptic).
StarSun.zip contains the
previous "Star and Sun Clock" and also a file StarSunZ.bas with added
drawings of the zodiacal constellations ("Z" for Zodiac). The drawing
resembles an astrolabe with "overhead" view which is a standard for the
star maps. Unzip all files in one directory. Read the instruction for
use and printing in the beginning of the file.
Sundial correction is a
modification a Fer de Vries' macro. It shows the total correction, i.e.
the Equation of Time + the Longitude correction in both Civil and
Daylight Savings Time.
(October 2017) Quadrant sundial for the whole year. See a picture.
(October 2017) Quadrant sundial for any separate month. The reading of the time is much more easier and accurate! (picture)
Perpetual Calendar with
Moon Phases (read some instructions in this zip file and see a
Moon Phases Calendar
(See the variant as a picture)
Star Clock for the Northern Hemisphere