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The Four Great Surveys and Our National Parks
Did you know that surveyors played a key role in creating our national parks? Our first park, Yellowstone (founded 1872), introduced the national park concept to the public and other parks soon followed – all this when most people still lived east of the Mississippi and most would not have the opportunity to see these natural wonders in person.
Geodesy and the Summer Solstice
Today is the Summer Solstice, the longest day of the year (in the Northern Hemisphere). Because Earth’s axis of rotation is tilted about 23.4 degrees relative to its orbit around the sun, this means that the different parts of the Earth receive the amount of light based on the position of the earth in its orbit around the sun. This tilt causes the earth’s seasons - From March to September, the Northern Hemisphere tilts more toward the sun, creating spring and summer, while in the Southern Hemisphere it’s fall and winter.