Text
Title 40: Protection of Environment
CHAPTER I: ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
SUBCHAPTER U: AIR POLLUTION CONTROLS
PART 1065: ENGINE-TESTING PROCEDURES
Subpart G: Calculations and Data Requirements
1065.630 - 1980 international gravity formula.
The acceleration of Earth's gravity, a
g, varies depending on your location. Calculate a
g at your latitude, as follows:
ER13JY05.059
Where:
? = Degrees north or south latitude.
Example:
? = 45?
a
g = 9.7803267715 ? (1+
5.2790414 ? 10?3 ? sin2 (45) +
2.32718 ? 10?5 ?sin 4 (45) +
1.262 ? 10?7 ?sin 6 (45) +
7 ? 10?10 ?sin 8 (45)
a
g = 9.8178291229 m/s2
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