# They're the Same!

Hooray, we get to write a little less on this page. Yes kids, the same units are used to measure time in both the customary and metric systems. The unit of measurement is based on a**second**. You'll need to convert to other amounts, but much of science is based on the second.

1 second = A number of

**oscillations**in a Cesium-133 or Iodine-127 atom. It depends on who you ask. It's the starting point.

1 minute = 60 seconds

1 hour = 60 minutes = 3,600 seconds

1 day = 24 hours = 1,440 minutes = 86,400 seconds

1 year = 365.25 days = 8,766 hours = 525,960 minutes = 31,557,600 seconds

1 leap year = 366.25 days (one every four years)

1 decade = 10 years

1 century = 10 decades = 100 years

1 millennium = 10 centuries = 100 decades = 1,000 years

1 light year = The distance that light travels in a vacuum during the time of one year. It's used in astronomy to measure the distance between planets, stars, systems, and galaxies. Even though it has year in the name, it's a measure of distance.

# Example

If I drove across country in four days, how many minutes would I be driving?4 days = 4 * 1,440 minutes = 5,760 minutes

We've got a lot more information about dates and time in our

**Basic Math**section if you missed it.

- Overview
- Graphing
- Exponents
**Measurements**- Adv. Numbers
- Rules of Math
- Sci Notation
- Variables
- More Maths Topics

# Useful Reference Materials

**Wikipedia:**

*https://en.wikipedia.org/wiki/Pre-algebra*

**Encyclopædia Britannica:**

*http://www.britannica.com/topic/mathematics*

**College of the Redwoods:**

*http://mathrev.redwoods.edu/PreAlgText/*