Days Study Guide

Introduction to Days

Days are a unit of time measurement that represents the time it takes for the Earth to complete one full rotation on its axis. This period of time is divided into 24 hours, and each day is denoted by a specific date on the calendar.

Types of Days

There are different types of days, such as:

• Solar day: The time between two successive returns of the Sun to the same meridian.
• Sidereal day: The time it takes for the Earth to complete one full rotation relative to the stars.
• Civil day: The 24-hour period that starts at midnight and ends at the following midnight.

Calculating Days

To calculate the number of days between two dates, you can use the following formula:

Number of days = (End date - Start date) + 1

Days of the Week

There are seven days in a week, which are:

1. Monday
2. Tuesday
3. Wednesday
4. Thursday
5. Friday
6. Saturday
7. Sunday

Conversion

To convert days to other units of time, you can use the following conversions:

• 1 day = 24 hours
• 1 day = 1440 minutes
• 1 day = 86400 seconds

[Days] Related Worksheets and Study Guides:

• Months of the YearMathematics • First Grade