Wall Clock Calendar
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 HORSE ROOM DECOR WALL CLOCK NEW  US $.98
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 9 BIKE MOTORCYCLE ROOM DECOR WALL CLOCK NEW US $.98
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 787 DREAMLINER ROOM DECOR WALL CLOCK NEW US $.98
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 HORSES PAINTING ROOM DECOR WALL CLOCK NEW US $.98
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 Talk to it Voice Controlled Projection talking alarm Clock Back light thermomete US $25.90
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 LAGOON NEBULA ROOM DECOR WALL CLOCK NEW US $.98
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 Digital Big Jumbo LED snooze wall desk alarm with count down indoor clock US $44.99
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 THE WITCHES BROOM NEBULA ROOM DECOR WALL CLOCK NEW US $.98
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 SECRETARIAT TRIPLE CROWN WINNER ROOM DECOR WALL CLOCK NEW US $.98
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 Dual Projector LCD ALARM CLOCK calendar thermometer US $8.78
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 LIGHTHOUSE OCEAN SHORE ROOM DECOR WALL CLOCK NEW US $.98
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 Digital Big Jumbo White LED Snooze Wall Desk Alarm Clock 3x1 in 613a US $48.50
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 WHITE TAILED DEERS ROOM DECOR WALL CLOCK NEW US $.98
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 SHARP RADIO CONTROLLED ATOMIC WALL CLOCK WITH WIRELESS OUT DOOR WEATHER SENSOR US $17.99
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 BUTTERFLY AND MUSHROOMS ROOM DECOR WALL CLOCK NEW US $.98
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 Hand Made Record Clock Great Gift Great Talking Piece 33 RPM Record US $9.99
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 LCD Digital Clock Thermometer and Humidity Meter E471 US $.99
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 Hand Made Clock Great Gift Great Talking Piece US $7.99
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 NEW LA CROSSE ATOMIC DIGITAL WALL CLOCK US $17.47
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 SmartWeather Digital Wireless Weather Station Sensor US $37.84
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 Digital Large Big Jumbo LED snooze wall desk alarm calendar world time clock US $29.98
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 Digital Large Big Jumbo LED snooze wall desk alarm calendar count down clock US $36.98
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 LCD Display PSTN¼ˆPhone Line¼‰Wireless Intelligent Music Home Alarm System100zones US $148.00
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 Cuisinart SS 700 Single Serve Brewing System Silver REFURBISHED US $122.95
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 VINTAGE CAST IRON METAL SLOTTED MAILBOX MAIL LETTER BOX HOUSE PORCH WALL MOUNT US $49.95
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 Nice peruvian leather bound wall clock straight from Peru US $25.00
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 Coby DP863 Digital Photo Frame US $24.99
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 La Crosse Technology WT 8005U B Atomic Digital Wall Clock w Indoor Temperature US $19.99
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 Lux Thermostat TX1500E Smart Temp Programmable US $19.99
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 West Elm Bird Alarm Clock New in Box Light Brown US $26.99
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 Kincaid JC801W RADIO CONTROL WALL CLOCK US $27.99
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 DYNAMIC LIVING OVERSIZED DIGITAL LED CALENDAR WALL CLOCK US $49.99
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 Desktop Wall Clock Temperature Humidity Calendar 061 US $14.90
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 Sunpak SDPF 121WB 0SL 121 Digital Picture Frame US $45.95
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 LA CROSSE PROJECTION ALARM CLOCK US $.99
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 Digital Large Big Jumbo LED snooze wall desk alarm count down world time clock US $36.98
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 Cuisinart Exact Heat Toaster Oven Broiler TOB 155 US $117.95
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 NEW DYNAMIC LIVING OVERSIZED DIGITAL LED CALANDER WALL CLOCK DL5003 16 X 75 US $16.49
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 34x16 HOWARD MILLER REGULATOR WALL CLOCK BEAUTY W CALENDAR HARDWOOD US $99.00
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 CONRAD Changing Color Projection Radio Controlled Alarm Clock Used DCF77 US $1.00
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 Digital Big Jumbo LED snooze wall desk alarm count down novelty clock US $44.99
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 Digital Big Jumbo LED snooze wall alarm calendar countdown large gadget clock US $33.99
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 ANTIQUE WOOD WOODEN HOME RECEIPT BOX WITH LIFT LID RESEMBLING OLD RECIPE BOX US $39.95
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 HOWARD MILLER SANDRINGHAM MODEL 613 108 WALL CLOCK US $29.99
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 SEHWA WALL CLOCK US $19.99
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 Big Digital Blue LED Wall Clock W Calendar Temperature Light Sensor 617b US $72.50
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 Digital Weather Temperature Humidity LED Wall Projection Snooze Alarm Clock US $114.99
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 LaCrosse Digital Atomic Wall Clock with Forecast Weather NIB LCD Screen US $49.95
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 Projector LCD ALARM CLOCK calendar C F thermometer RED Digit projection NEW US $7.80
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 La Crosse Technology Atomic Digital Wall Clock US $24.55
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 LCD Thermometer Hygrometer hign low Temp Humidity Clock shipped same day USA US $9.85
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 600mg 2in1 Cycle ANION OZONE Generator Air Water Purifier Oil Ozonator Kill Odor US $57.99
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 Krups KM1000 10 Cup Stainless Steel Coffeemaker US $49.95
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 Retro Calendar Wall Clock US $19.95
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 Krups FMF5 10 cup Thermal Prog Coffee Machine FMF5 14 US $76.49
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 Sonic Alert SBP100 Sonic Boom Portable Vibrating Alarm Clock US $23.09
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 Dynamic Living Oversized 16 inch X 75 inch Digital Led Calendar Wall Clock NEW US $94.99
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 Digital Clock Calendar Temp Alarm Count Down Or Up Timer Wall Or Stand Indoor US $18.95
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 Sentry CL10W 10 Large Number Wall Clock White US $14.95
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 Big Digital Red LED Wall Clock W Calendar Temperature Light Sensor 617a US $69.50
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 Jumbo large display digital desktop wall clock ref386 US $12.62
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 Geneva 14 Inch Weathered Plastic Wall Clock US $24.81
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 Cherry Atomic Wall Clock with Moon Indoor Outdoor Temperature WS 8117U IT C US $36.99
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 Krups FME2 14 Coffee Machine with 12 Cup Glass Carafe Black US $56.49
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 Infinity Instruments Spangler 12 Metal Wall Clock US $20.78
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 La Crosse Technology Atomic Digital Wall Clock with Temp and Weather Forecast US $37.50
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 La Crosse Technology Atomic Digital Wall Clock with Moon Phase Temp US $32.99
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 NEW SkyScan Atomic Digital Clock Indoor Outdoor Temp Sensor US $35.95
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 Digital Large Big Jumbo LED snooze wall desk alarm with calendar travel clock US $36.98
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 Modern Retro Home Decor Mechanical Large Calendar Round Wall Gear Clock SILVER US $96.99
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 La Crosse Technology Atomic Digital Wall Clock with Date and Temp Display US $24.99
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 Modern Chocolate Big LCD LED Alarm Wall Digital Clock Long Version US $19.99
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 IMPECCA DFM 1512 15 Digital Photo Frame with 2GB Memory DFM1512 DFM 1512 US $142.99
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 AcuRite 475 in H Digital Rain Gauge with Wireless Self Emptying Rain Collector US $25.00
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 Howard Miller 625 283 Aries Wall Clock by US $47.07
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 Infinity Instruments Facile Gunmetal Wall Clock US $29.05
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 Acctim Stratus Light Radio Controlled Desk Wall Clock US $190.35
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 Geneva 12 Inch Wine Wall Clock US $17.51
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 Disneys Cars Wall Clock 10 Inch US $14.94
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 Pyle Handheld Digital Fishing Hunting Watch with Tide Altimeter Barometer The US $39.79
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Calendars and the Measurement of Time
We are all aware of the passing of time; it governs us throughout our lives constantly ebbing away, dictating when we should eat, sleep, wake or work.
Yet, the concept of time has baffled philosophers and scientists for millennia and we are still unsure of exactly what time is; although the work of Einstein and others has led us some way in its understanding.
However, exactly what time is does not really matter in the running of our day-to-day lives, but measuring its passing has preoccupied people for thousands of years. Calendars have been around for millennia, agricultural, religious and social reasons have made them essential in forecasting when to harvest crops or when to celebrate a religious event.
The majority of all calendar systems have been based on the movement of the Earth or Moon. A complete rotation is a day; the Moon’s orbit of the Earth is a month; and an orbit of the Sun is a year.
Calendars based on the movement of Moon are known as lunar calendars whilst those based around Earth’s orbit of the Sun are called solar calendars. Because the number of days in a year is not a whole number (the Earth takes 365 days and six hours to orbit the Sun) solar calendars have to fudge the figures, usually by adding an extra day every few years (a leap day) making a leap year a day longer than the rest of the years.
Problems arise with lunar calendars too. While the Moon takes 28 days to circle the Earth, which can be divided into seven (four weeks) a year can’t be divided into equal lunar cycles, so months have to have a different number of days (the moon actually goes around the Sun 13 times in 364 days).
The baseline for calendars (the date they start counting) depends on cultural or religious reasons. The Gregorian calendar, adopted in Europe throughout the middle ages, used the birth of Christ; whilst a year in Japan is based on the current emperor’s reign (2008 is year 18 of the Emperor Akihito).
The main use of calendars has always been to identify events and in modern times they are often combined and used along with time to create a complete timescale. A calendar based on the movement of the Earth or Moon are less relevant today since the advent of accurate timepieces and modern technologies such atomic clocks, NTP servers (Network Time protocol) and GPS (Global Positioning System). These have allowed the development of a global standardised time scale (known as UTC – Coordinated Universal Time).
However, thanks to these technologies, we now know that the movement of the Earth is not as accurate as our modern clocks (an atomic clock is 1,000,000 times more stable than the Earth’s rotation). The Earth actually slows down (and sometimes accelerates) in its orbit. If nothing was done to compensate for this, eventually noon would become midnight and vice versa (albeit in many millennia) so leap seconds are added to the standard time scale just as days are added in a leap year.
In modern times calendars are still used. The Gregorian calendar is widespread throughout the West and other calendars have been developed such as fiscal calendar, developed by business as a way of comparing productivity or profit from month to month and year to year. For this reason fiscal calendars have a fixed number of weeks in a month, January may have five weeks while March may have four. Other calendars exist too such as those used by schools or sports.
About the Author
Richard N Williams is a technical author and a specialist in the telecommunications and network time synchronisation industry helping to develop dedicated time server products. Please visit us for more information about a GPS time server or other NTP server products
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