Time

RULES TO LEARN

60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
7 days = 1 week
2 weeks = 1 fortnight ("fourteen nights")
365 days = 1 year
366 days = 1 leap year (every 4 years e.g. the years 2012, 2016)
52 weeks - 1 year
26 fortnights = 1 year
12 months = 1 year
10 years = 1 decade
100 years = 1 century
1000 years = 1 millennium
MNEMONIC - DAYS OF EACH MONTH

Thirty days have September
April, June and November.
All the rest have 31
Except February
That, when comes the time
In leap year, has twenty-nine.

Example - Converting Time Units

Converting large unit to small unit (Multiply)
10 minutes = 600 seconds
2 years = 104 weeks
3 weeks = 21 days
5 fortnights = 70 days
3 decades = 30 years

Converting small unit to large unit (Divide)
30 minutes = 30 ÷ 60 = 0.5 hour
45 minutes = 45 ÷ 60 = 0.75 hour
12 hours = 12 ÷ 24 = 0.5 day
13 weeks = 13 ÷ 52 = 0.25 year
30 years = 30 ÷ 100 = 0.3 century


Did You Know That...?

Daguerres First Photograph

This first ever photograph was taken by Louis Daguerre, an artist and physicist, in Paris in 1838. Only 3 people can be seen in his photograph, but because Daguerre used Time Lapse Photography, there would have been many more people moving in and out of view over the 15 minutes that the photographic plate was exposed.

You can create your own time lapse photographs with an ordinary camera by lengthening the exposure time. Try to make a "ghost" photograph by asking a person to stay still in front of the camera for about five seconds and then slowly moving out of view.

Questions

Complete these time conversions.

Q1. 15 minutes = hour
Q2. 20 hours = minutes
Q3. 1 day = minutes
Q4. 72 hours = days
Q5. 3 fortnights = days

Answers
A1. 0.25
A2. 1800
A3. 1440
A4. 3
A5. 42

Did You Know That...?

The Summer Solstice (Mid-summer) occurs on the day of the year with the most number of hours of daylight. In the northern hemisphere, this occurs on June 20th or 21st. In the southern hemisphere, this happens on December 21st or 22nd. Similarly, the Winter Solstice (Mid-winter) has the least number of hours of daylight. In the northern and southern hemispheres respectively, this occurs on December 21st or 22nd and June 20th or 21st.

An Equinox has equal number of hours of daylight and dark. The northern hemisphere's Spring Equinox is March 20th or 21st. The southern hemisphere's Spring Equinox is September 22nd or 23rd. The Autumnal (Fall) Equinox is September 22nd or 23rd in the northern hemisphere and March 20th or 21st in the southern hemisphere.