2020 - the leap year at a glance with the circular calendar by Marmota Maps! Create an infographic of your personal year and learn everything about leap years, and about the length of days and years on all eight planets of the solar system.

This calendar is available on request.
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New release: 08-18-2019
Size: 600 x 600 mm
Print: Offset 250g matt
Language: German
ISBN: 978-3-946719-38-0


The calendar is composed of a number of rings around the inner circle. From the outside to the inside these rings show: the moon phases, fields for personal notes and holidays (in Germany, Austria and Switzerland), fields for your own markings, dates and days of the week, calendar weeks, and months.
Our infographic in the center provides information about leap years, as well as about the length of days and years on all eight planets of the solar system.

Kalender 2020

Your very own year of 2020

One large field offers space for personal notes from appointments to birthdays and other celebrations, your ski vacation or the hiking trip. Three other rings are intended for graphical markings, like for instance athletic activities, visits to the movies, or the theater, or your personal count of the days since you gave up smoking. At the end of the year you have created a personal, infographic over the course of your year.

Kalender 2020 - persönliche Einträge

Kalender 2018 - persönliche Einträge

2020 - the leap year

The Gregorian calendar is based on the seasons and thus on the tropical year on earth, which has a length of approximately 365.242 days. In order to balance this number with the 365 years of a calendar year we add an extra leap day every four years, which equals 0.25 days per year. To further approach the remaining rest of 0.08 days, in three of four turns of the centuries the additional leap day is left out.
In leap years February has 29 instead of the regular 28 days. Without the leap day each year our calculation of time would be offset by about six hours each year. The seasons, defined by solstices and equinoxes, wouldn't begin on the same dates anymore. After 100 years the difference would be roughly 24 days. The beginning of summer wouldn't be in June anymore, but in July.

Kalender 2020 - Schaltjahr

Kalender 2020 - Schaltjahr

The Planets

Kalender 2020 - Sonnensystem

Kalender 2020 - Jupiter

Kalender 2020 - Saturn

We provide the most important data about the length of rotations, days and years of all eight planets of the solar system - from Mercury to Neptune.

Kalender 2020

Kalender 2020

The concept of the circular calendar

Our calendars are supposed to show the whole year on one sheet. For us the circle has the ideal shape for this. A year is illustrated as a closed phase.
The circle is also a matching symbol for rotational events which we experience each year. The length of the year is defined by the circular rotation of Earth around the sun. After one year Earth returns to the same relative position in relation to the sun. The succession of the seasons, of holidays and celebrations, also repeats itself each year in a circular flow.

Kreiskalender 2020 - 2019 - 2018