15 U.S.C. § 261 : US Code - Section 261: Zones for standard time; interstate or foreign commerce

Search 15 U.S.C. § 261 : US Code - Section 261: Zones for standard time; interstate or foreign commerce

For the purpose of establishing the standard time of the United
States, the territory of the United States shall be divided into
nine zones in the manner provided in this section. Except as
provided in section 260a(a) of this title, the standard time of the
first zone shall be based on the mean solar time of the sixtieth
degree of longitude west from Greenwich; that of the second zone on
the seventy-fifth degree; that of the third zone on the ninetieth
degree; that of the fourth zone on the one hundred and fifth
degree; that of the fifth zone on the one hundred and twentieth
degree; that of the sixth zone on the one hundred and thirty-fifth
degree; that of the seventh zone on the one hundred and fiftieth
degree; that of the eighth zone on the one hundred and sixty-fifth
degree; and that of the ninth zone on the one hundred and fiftieth
meridian of longitude east from Greenwich..(!1) The limits of each
zone shall be defined by an order of the Secretary of
Transportation, having regard for the convenience of commerce and
the existing junction points and division points of common carriers
engaged in interstate or foreign commerce, and any such order may
be modified from time to time. As used in sections 261 to 264 of
this title, the term "interstate or foreign commerce" means
commerce between a State, the District of Columbia, the
Commonwealth of Puerto Rico, or any possession of the United States
and any place outside thereof.