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The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00(:00) to 23(:59), with 24(:00) as an option to indicate the end of the day.
The Indic day began at sunrise. The term hora was used to indicate an hour. The time was measured based on the length of the shadow at day time. A hora translated to 2.5 pe. There are 60 pe per day, 60 minutes per pe and 60 kshana (snap of a finger or instant) per minute. Pe was measured with a bowl with a hole placed in still water.
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").
Horas (Toba Batak: ᯂᯬᯒᯘ᯲) is the Batak word to express gratefulness, happiness, and healthiness, however it is more commonly used as a simple greeting and goodbye. It is the equivalent to "hello" or "goodbye". [ 1 ]
The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.
A day is unity, or 1, and any fraction thereof can be shown with digits to the right of the hexadecimal separator.So the day begins at midnight with .0000 and one hexadecimal second after midnight is .0001.
The various aspects of hora are: Jātaka Shāstra (Natal astrology): Prediction based on individual horoscope. Muhurta or Muhurtha (Electional astrology): Selection of beneficial time to initiate an activity to get maximum fruition from the life activities. Swara Shāstra (Phonetical astrology): Predictions based on name & sounds.
Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour.