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www.reference.com/article/create-calendar-a16336c59a3ad6d8

Creating a calendar is as simple as printing blank calendar pages and customizing them as necessary or desired. There are also a variety of creative and artistic homemade calendar ideas.

www.reference.com/article/difference-between-astronomical-dates-astrological-signs-df27ec94a622f4cf

Astronomical dates refer to days on which a celestial event occurs, such as a meteor shower or full moon. Astrological signs, on the other hand, indicate the position of the sun on one's birthday.

www.reference.com/article/different-types-calendars-c97cd0c50a4fa7d4

The types of calendars used by societies have varied throughout history. According to the education website EDinformatics, lunar calendars are synchronized to the phases of the moon, whereas solar calendars are linked to the perceived movement of the sun causing the changes of the seasons. Lunisolar

www.reference.com/article/school-calendar-7df5f784edc9579a

A school calendar is very similar to any other calendar used to keep track of important dates and events. Schools often issue their students and parents school calendars that include the events or details of each school day in the year.

www.reference.com/article/online-calendars-dffb0be007626674

The Internet is full of websites that provide free online calendars including WinCalendar.com, CalendarLabs.com, PrintableCalendar.ca and Localendar.com. Each of these websites features different design elements for different calendar needs. Calendars in Word, Excel and PDF formats are available at

www.reference.com/article/calendar-month-52b850fad1963633

According to Longman Dictionary of Contemporary English, a calendar month is a full month or a specific date in one month that corresponds to the same day in the next. Months were first used in Mesopotamia and revolved around the cycles of the moon.

www.reference.com/article/measure-astronomical-distances-light-years-astronomical-units-994744d9ccc3c2c2

An astronomical unit, or AU, and a light-year are two separate measurements that are used for different distances in space. According to the University of Nebraska, an AU is the smallest distance used to measure distances in space, and the light year is the standard measurement for interstellar dist

www.reference.com/article/astronomers-use-light-years-measure-distances-space-494a46632e6307e2

Astronomers use light years to measure distances in space because space is so massive and distances so far that conventional numbering is inadequate and unmanageable. One light year is a distance measurement equivalent to six trillion miles.

www.reference.com/article/primary-purpose-astronomical-telescope-22386a983873b301

The astronomical telescope is a central apparatus used to study distant planets, stars and moons from the Earth. Astronomer Galileo Galilei famously used the earliest telescopes in 1610 to prove the heliocentric solar system theory put forth by Nicolaus Copernicus in the early 16th century.

www.reference.com/science/invented-first-calendar-f4255d5095d8fd98

Evidence indicates that the first calendar was created by the Stone Age people in Britain about 10,000 years ago. The earliest known calendar was a lunar calendar, which tracked the cycles of the moon.