Candles are a leading cause of home fires and fatalities. Soot on the walls and furnishings is unsightly, and may also be a sign of serious problems. It may also be unhealthy, as inhalation of minute particles of soot has been documented to cause health problems.
It is a popular misconception that the phenomenon of a total eclipse of the sun is a rare occurrence. Quite the contrary. Approximately once every 18 months (on average) a total solar eclipse is visible from some place on the Earthâs surface. That's two totalities for every three years.
1) How often do lunar eclipses happen? During the 21st century, there are 85 total lunar eclipses; a specific geographical location on the surface of the Earth will be able to see an average 40 to 45 total lunar eclipses or about one about every 2.3 years.