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The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (300 m) away and wherever possible set at the same level. The projector is normally set at 90°, although 71° 31' may be used, in relation to ...
A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling. [1] The clock can be placed almost anywhere if only the projected image must be seen.
People usually use nightlights for the sense of security which having a light on provides, or to relieve fear of the dark, especially in young children.Nightlights are also useful to the general public by revealing the general layout of a room without requiring a major light to be switched on, for avoiding tripping over stairs, obstacles, or pets, or to mark an emergency exit.
Embrace Date Night In. Fancy date nights sound great in theory, but between late nights at work and taking care of everything around the house, sneaking out for one is easier said than done.
A ceiling balloon is a small, usually red, (fluted) rubber balloon commonly measuring 76 mm (3 in) across prior to inflation, inflated to ~40 cm (~15.75 in) diameter. After inflation the balloon is taken outside and released. By timing the balloon from release until it enters the cloud a ceiling height can be obtained.
The northern lights will be visible for parts of the northern U.S., according to the NOAA Space Weather Prediction Center's aurora forecast. The aurora will be visible over much of Canada and ...