True, Ancient people created calendars partly because they needed to understand the natural world., Lunar calendars are based on the phases of the Moon., Solar calendars are connected to the Earth's journey around the Sun., The Julian calendar was introduced by Julius Caesar., The Julian calendar included an extra day every four years., The Gregorian calendar was introduced in 1582., The Gregorian reform helped bring the calendar closer to the seasons., Calendars have also been important for religion, agriculture and government., False, Ancient calendars were based only on the Sun., The Julian calendar had exactly 364 days., The Julian calendar was completely accurate., Every country immediately adopted the Gregorian calendar.

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