Reasoning :Clock and Calendar Calendar: Import Points to remember A calendar is a particular measure of time. The smallest unit of a calendar is a day which is the average time in which earth turns round once on its axis, The time in which earth travels round the sun is known as a solar year which consists of 365 days, 5 hours, 48 minutes and 47 ½ seconds or approximately 365.2422 days. Generally we take the year consisting of365 days. The difference between a solar year and a common year is 0.2422 of a day. This difference is taken into .account every fourth year by adding a whole day. Thus every fourth year has a total of 366 days and this year. is called a leap year. This extra day is added to the month of February and as such in every leap year February has 29 days. The number of days more than the complete number of weeks in a given period, are called odd days. In an ordinary year (of 365 days) there are 52 weeks and one odd days. 2 In a leap year (of 366 days) there are 52 weeks ...