The Olmecs used 3 calendars.
Ancient Hindus generally made use of lunar calendars and solar calendars.
CHANGE In temperature climate time
calendars, jars, pots
There are many websites you can use to create calendars online depending on what you want to add to it. One such option is http://www.lulu.com/publish/calendars/.
Their priests looked at the sky and made calendars. From the use of those calendars they were able to "predict" the future. They even had some ceremonies in which somebody was sacrificed so the gods would send a message to a priest about a future event. They also believed in many omens, before the fall of the Aztec empire, during Montezuma's rule there were many omens about a catastrophe coming to the Aztec empire.
Historians would use calendars all the time. They are a major part of their work. They are constantly using dates and checking up on them, so calendars are essential to them. They could not work without calendars.
Yes
Julius Caesar
Yes.
Teachers occasionally use erasable wall calendars. It's a cost efficient way to keep track of the monthly activities within the room. Erasable wall calendars can last years before needing to be replaced.
There are many places to find printable calendars. Calendar labs has simple, basic calendars for everyday use. Printablecalendar.ca has a variety of calendars with different layouts and you can add your own photo.