Old Faithful is a geyser located in Yellowstone National Park in Wyoming, United States. It is known for its predictable eruption intervals, which typically range from about 65 to 90 minutes. However, the exact frequency of Old Faithful’s eruptions can vary, and it is not known to erupt exactly twice per year.
The most common interval between Old Faithful’s eruptions is around 75 minutes, but this can vary depending on a number of factors, such as the temperature of the water and the amount of steam pressure that has built up in the geyser. Additionally, Old Faithful is not the only geyser in the park, and there are many other geysers that erupt at different intervals and with varying degrees of regularity.
In general, Old Faithful is considered to be one of the most predictable geysers in the world, but its exact eruption schedule cannot be determined with absolute precision. Visitors to Yellowstone National Park can check the Old Faithful eruption predictions board near the geyser to get an idea of when it is likely to erupt, but these predictions are not always accurate.
As a result, it is not accurate to say that Old Faithful erupts exactly twice per year. While the geyser is known for its regular eruptions, the exact timing and frequency of these eruptions can vary. If you are planning a trip to Yellowstone National Park, it is best to check the Old Faithful eruption predictions board and plan your visit accordingly, rather than assuming that the geyser will erupt at a specific time.