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Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
The 42nd parallel north defining borders between states in the United States Crossing the parallel in Girard, Pennsylvania. The parallel 42° north forms most of the New York–Pennsylvania border, although due to imperfect surveying in 1785–1786, this boundary wanders around on both sides of the true parallel.
Township lines run parallel to the baseline (east-west), while range lines run north–south; each are established at 6-mile intervals. Lastly, townships are subdivided into 36 sections of approximately 1 square mile (640 acres; 2.6 km 2 ) and sections into four quarter-sections of 0.25 square miles (160 acres; 0.65 km 2 ) each.
The parallel 36°30′ north is part of a nearly straight east–west line of state borders (with small variations) starting on the East Coast of the United States, beginning with the border between Virginia and North Carolina. However, this boundary and the one between Kentucky and Tennessee lie a few miles north of 36°30′ in places.
In the United States, the 33rd parallel approximately defines the border between Arkansas and Louisiana. The 33rd parallel north is a circle of latitude that is 33 degrees north of the Earth's equatorial plane. It is approximate at the midpoint between the equator (0 degrees) and the Arctic Circle (66.6 degrees North Latitude.)
The 31st parallel north is a circle of latitude that is 31 degrees north of the Earth's equatorial plane. It crosses Africa , Asia , the Pacific Ocean , North America , and the Atlantic Ocean . At this latitude the sun is visible for 14 hours, 10 minutes during the summer solstice and 10 hours, 8 minutes during the winter solstice .
The 37th parallel north is a circle of latitude that is 37 degrees north of the Earth's equatorial plane. It crosses Europe , the Mediterranean Sea , Africa , Asia , the Pacific Ocean , North America , and the Atlantic Ocean .
The 35th parallel north is a circle of latitude that is 35 degrees north of the Earth's equatorial plane. It crosses Africa , the Mediterranean Sea , Asia , the Pacific Ocean , North America and the Atlantic Ocean .
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