The seasons drawn by Nick Lomb. On Saturday 22 December 2007 at 5:08 pm Australian eastern summer time the Earth is at summer solstice. This is when the Sun appears at its most southerly position for the year and, for those of us in the southern hemisphere, it is the longest day of the year. In Sydney the Sun is above the horizon for 14 hours and 25 minutes.
Back-end systems deal with databases and data processing components, so the purpose of the back-end system is to launch the operating system's programs in response to front-end system requests and operations. In other words, the back-end system implements responses to what the front end has initiated.
For other meanings of the term, see backfire (disambiguation). A back-fire or backfire is combustion or an explosion produced by a running internal combustion engine that occurs in the air intake or exhaust system rather than inside the combustion chamber.nburned fuel or hydrocarbons that are ignited in the exhaust system can produce loud sounds even if flames are not present at the tailpipe. A visible flame may momentarily shoot out of the exhaust pipe where the exhaust system is shortened. Fire may also travel into the air intake piping.