Observation a many leap years
From observantly that A.D. far for 28 years will be same as 1952 A.D. + 28 = 1980
If you add 28 on and on or down and down, will be equal to be result of add or minus as...
Technic to memorize this principle is principle of leaf year add to 4. So 4, 8, 12, 16, 20, 24 for from 28 do not take it, cause far from 28 years calendar well same.
And memorize of counting up number are 2, 4, 6, 1, 3, 5 are an even number as follow by an odd number
Usefulness from this principle is
From observantly that A.D. far for 28 years will be same as 1952 A.D. + 28 = 1980If you add 28 on and on or down and down, will be equal to be result of add or minus as...
Technic to memorize this principle is principle of leaf year add to 4. So 4, 8, 12, 16, 20, 24 for from 28 do not take it, cause far from 28 years calendar well same.
And memorize of counting up number are 2, 4, 6, 1, 3, 5 are an even number as follow by an odd number
Usefulness from this principle is
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