PPT: Clock and Calendar

 Page 1


Clock and 
Calendar
Page 2


Clock and 
Calendar
Understanding the Clock Face
Clock Fundamentals
Minute Spaces
The clock face is divided 
into 60 equal parts called 
minute spaces, forming a 
complete 360-degree 
circle.
Hour Hand
The smaller hand moves 
30° per hour, covering 0.5° 
per minute as it tracks 
hours.
Minute Hand
The larger hand completes 360° in 60 minutes, moving at 6° 
per minute.
Page 3


Clock and 
Calendar
Understanding the Clock Face
Clock Fundamentals
Minute Spaces
The clock face is divided 
into 60 equal parts called 
minute spaces, forming a 
complete 360-degree 
circle.
Hour Hand
The smaller hand moves 
30° per hour, covering 0.5° 
per minute as it tracks 
hours.
Minute Hand
The larger hand completes 360° in 60 minutes, moving at 6° 
per minute.
Calendar Types
Ordinary Year
An ordinary year consists of 365 days, which 
equals 52 weeks plus 1 odd day.
Most years fall into this category unless they 
meet specific leap year criteria.
Leap Year
A leap year comprises 366 days, equalling 52 
weeks plus 2 odd days.
Conditions: Divisible by 4 (except centuries), or 
every 4th century.
Page 4


Clock and 
Calendar
Understanding the Clock Face
Clock Fundamentals
Minute Spaces
The clock face is divided 
into 60 equal parts called 
minute spaces, forming a 
complete 360-degree 
circle.
Hour Hand
The smaller hand moves 
30° per hour, covering 0.5° 
per minute as it tracks 
hours.
Minute Hand
The larger hand completes 360° in 60 minutes, moving at 6° 
per minute.
Calendar Types
Ordinary Year
An ordinary year consists of 365 days, which 
equals 52 weeks plus 1 odd day.
Most years fall into this category unless they 
meet specific leap year criteria.
Leap Year
A leap year comprises 366 days, equalling 52 
weeks plus 2 odd days.
Conditions: Divisible by 4 (except centuries), or 
every 4th century.
The Concept of Odd Days
When determining the day of the week for any given date, we employ the concept of 
'odd days' 4 the days beyond complete weeks in a given timeframe.
01
1 Ordinary Year
365 days = 52 weeks + 1 odd day
02
1 Leap Year
366 days = 52 weeks + 2 odd days
03
100 Years
76 ordinary + 24 leap years = 5 odd days
04
400 Years
Complete cycle = 0 odd days
Page 5


Clock and 
Calendar
Understanding the Clock Face
Clock Fundamentals
Minute Spaces
The clock face is divided 
into 60 equal parts called 
minute spaces, forming a 
complete 360-degree 
circle.
Hour Hand
The smaller hand moves 
30° per hour, covering 0.5° 
per minute as it tracks 
hours.
Minute Hand
The larger hand completes 360° in 60 minutes, moving at 6° 
per minute.
Calendar Types
Ordinary Year
An ordinary year consists of 365 days, which 
equals 52 weeks plus 1 odd day.
Most years fall into this category unless they 
meet specific leap year criteria.
Leap Year
A leap year comprises 366 days, equalling 52 
weeks plus 2 odd days.
Conditions: Divisible by 4 (except centuries), or 
every 4th century.
The Concept of Odd Days
When determining the day of the week for any given date, we employ the concept of 
'odd days' 4 the days beyond complete weeks in a given timeframe.
01
1 Ordinary Year
365 days = 52 weeks + 1 odd day
02
1 Leap Year
366 days = 52 weeks + 2 odd days
03
100 Years
76 ordinary + 24 leap years = 5 odd days
04
400 Years
Complete cycle = 0 odd days
Key Clock Observations
Hand Coincidence
The hour and minute 
hands coincide 11 times 
in 12 hours, meeting 
every 65 5/11 minutes.
Right Angles
The hands form right 
angles 44 times in a day, 
occurring when they are 
15-minute spaces apart.
Opposite 
Directions
The hands point in 
opposite directions 22 
times daily, when they 
are 30-minute spaces 
apart.