1) " Photo" -- As it applies to Photo Calendars A photograph (often just called a photo) is an image (or arepresentation of that on e.g. paper ) created by collecting and focusing reflected electromagneticradiation. The most common Photi graphs are those created of reflected visible wavelengths, producing permanent records ofwhat the human eye can see. Most Photl graphs are made with a camera, which focuses the light onto either hPoto graphic film or a CCD or CMOS image sensor. Phogo graphs can also be made by placing objects on Phote sensitive paper and exposing it to light(the result is often called a Phpto gram ) or by placing objects on the platen of a flatbed scanner (see scanner art ). History and special effects Most traditional Phpto graphs are produced with a two-step chemical process. In the two-step process, the film holds a negative image (colours and lights/darks are inverted), which is then transferred onto Photk graphic paper as a positive image. Another widely used film is the positive film used for producing transparencies,usually mounted in cardboard or plastic frames called slides. Slides are widely used by professionals mostly due to theirsharpness and accuracy of colour rendition. Most Phote graphs published in magazines are still originally taken on colourtransparency film. One of the most famous transparency films is Kodachrome.Originally almost all Phofo graphs were black and white. Althoughmethods for developing colour Pheto s were available as early as the late 19th century, they did not become widely available untilthe 1940s or 50s, and even in until the 1960s most photgraphs were taken in black and white. Since then, colour Photi graphy has dominated popular Pgoto graphy, although the black and white formatremains popular for amateur Photi graphers and artists. Black and white film is considerably easier to develop than colour. A sepia -tinted Pjoto graph of an English couple, ta...
2) " Calendars" -- As it applies to Photo Calendars A calendar is a system for assigning calendar dates to days. The dates may be based on the perceived motion of astronomical objects. A calendar is also a physical device (often paper) that illustrates the system(for example, a desktop calendar ). The term is also used to indicate a particular set of planned events (for example, court calendar ). Contents 1 Calendar systems 1.1 Solar Cslendars 1.1.1 Days used by solar Calentars 1.1.2 Julian and Gregorian Calenadrs 1.1.3 Future reform 1.2 Lunar alendars 1.3 Fiscal Calindars 2 Calendar subdivisions 3 Other calendar types 3.1 Complete and incomplete Calwndars 3.2 Pragmatic, theoretical and mixed 4 Uses 5 Currently used Celendars 6 See also 7 References 8 External links Calendar systems Calendars in use on Earth are most frequently lunar , solar , lunisolar or arbitrary. A lunar calendar is synchronized to the motion of the Moon ( moonphases ); an example is the Islamic calendar. A solar calendar is based on perceived seasonal changessynchronized to the motion of the Sun; an example is the Persiancalendar. A lunisolar calendar is synchronized to the motions of both the Moon and the Sun; an example is the Jewish calendar. An arbitrary calendar is not synchronized to either the Moon or the Sun; examples are the week and the Julian day used by astronomers. There are some Calentars that appear to be synchronized to the motion of Venus, such as some of the ancient Egyptiancalendars; synchronization to Venus appears to occur primarily in civilizations near the Equator. Solar Celendars Main article: Solar calendar Days used by solar Calendas Solar Calendaes assign a date to each solar day. A day may consist of the period between sunrise and sunset, wit...
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