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A year is the orbital period of a planetary body, for example, the Earth, moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by change in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the planet, four seasons are generally recognized: spring, summer, autumn and winter. In tropical and subtropical regions, several geographical sectors do not present defined seasons; but in the seasonal tropics, the annual wet and dry seasons are recognized and tracked.
A calendar year is an approximation of the number of days of the Earth's orbital period, as counted in a given calendar. The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars (see below). For the Gregorian calendar, the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days. In English, the abbreviations "y" and "yr" are commonly used ("a" is also used) for the unit of time, though its exact duration may be inconsistent.
In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year.The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Similarly, year can mean the orbital period of any planet; for example, a Martian year and a Venusian year are examples of the time a planet takes to transit one complete orbit. The term can also be used in reference to any long period or cycle, such as the Great Year.

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  1. T

    Replace 50 year old gloworm ?

    I have a very old Gloworm boiler. Been advised by gas engineer to replace for modern unit. It's working fine but worried about availibilty of parts and getting a plumber to work on it. Any advise ?
    • Throbbin Robin
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    • Forum: USA
  2. candell

    Problem with toilets in 6 year old house

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    • candell
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    • Forum: USA
  3. R

    4 siemens 3 port valves burnt out in a year.

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    • RayPlumb
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  4. S

    10 year old Bosch Greenstar Junior water sloshing noise, then fault

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    • Skippydoo
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    • america bosch fault greenstar junior noise old usa water year
    • Replies: 3
    • Forum: USA
  5. V

    Replacement for Britony 2t water heater

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  6. CorgiDirect

    FREE 1st Year Service on Testo 300, New 2020 327, 320 & 320B Kits

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    • CorgiDirect
    • Thread
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    • Forum: USA
  7. H

    UFH Leaks 1 year after installation

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  8. rpm

    Next year holiday plans

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  9. townfanjon

    That time of year again

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  10. centralheatking

    NEW YEAR PLANS for younger engineers

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    • centralheatking
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  11. centralheatking

    BBC .. Couples 48 year old boiler finally packs up

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  12. M

    is it OK to leave heaters off all year round?

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  13. R

    Poll: who has used their central heating this year?

    I'm wondering when most people start to use central heating, and how we differ in our use of it. Probably it's relevent WHERE we are: I'm in northeast Essex and haven't had the heating on yet.
  14. M

    The start of my 4 year journey!

    Hey there dudes and dudettes! 🙋 Although my profile labels me as a general plumber, I'm actually working as a labourer for a engineering firm specialising in heating, vent, plumbing etc. Only 8 weeks in but suddenly find myself on a nvq level 2 heat and vent course which is splendid news for me...
  15. M

    Condensate trap on one year old boiler

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  16. Dan

    FIXRADIO - Tradesperson of the Year Awards 2019 - Nominations wanted!

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  17. M

    40 year trainee plumber looking for work in South East London/Kent and Surrey

    Good afternoon I am seeking part time work on Thursdays and Fridays in the above locations if possible please. I have had previous experience on the tools and have recently paid for and completed my City and Guilds 6129 diploma in plumbing and heating. I have all my own tools and a csr to...
  18. J

    Alpha Boiler with 13 Year Guarantee

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  19. Rob Foster

    1.6M Heating Systems Fitted Last Year

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  20. Scott_D

    10 year warranty on Ravenheat

    Ravenheat are giving 10 year warranty on their top end combi Would you fit one?
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