In the Roman Catholic Church, candles are placed before a statue of Jesus or of the Blessed Virgin Mary. Often, in older or traditional churches, this will be before a side altar. Candles used may vary from long, taper-type candles to tealight candles. Tealight candles are either placed in holders or just on a platform in front of the statue. Long candles may be placed in a special holder. The longer candles seem to be more common in Europe -- the above photograph is from a French cathedral.
The Planetary Hours are a belief that sections of each day are ruled by certain heavenly bodies, and that these times of day can be utilized by those who understand their secrets to improve success in certain types of ventures. Folks like Jim Haskins and Tarostar have printed slightly incorrect versions of "Venus Hours" which have been popularly repeated: the claim that 2 AM, 9 AM, 4 PM and 11 PM on a Sunday, 6 AM, 1 PM and 8 PM on Monday, etc, are Venus Hours is wrong. This is a problem that goes back to the 18th century at least -- the Petit Albert itself mentions the mistake. The error stems from the notion that planetary hours align to hours on the clock -- they do not. As the Albert puts it: "In order that there be no mistakes about the hours that each planet rules [...] one needs to reckon the first hour from the sunrise, and not by midnight, as some people have erroneously claimed." In other words, the planetary hours are reckoned by a solar clock. T...