Hints on using UT

Because UT is 5 hours ahead of Eastern Standard Time, UT midnight occurs at 7 p.m. in the eastern United States, and the UT date changes in the middle of an early-evening observing session. Farther west, the UT date is ahead of the local date throughout the evening. I once missed a lunar eclipse because when converting the time from UT, I forgot to convert the date.

You can get the exact time, in UT, from any GPS receiver, or by listening to shortwave radio station WWV (2.5, 5.0, 10.0, and 15.0 MHz), or from Internet sites such as http://www.usno.navy.mil.

LMjY

LMjY

X

W

>;<i>

V

w

NT

X

.w

W

w'"

E

F

G

H

I

K

AuC

L MY

STANDARD TIME ZONES

Corrected to November 2001

Zone boundaries are approximate Daylight Saving Time (Summer Time), usually one hour in advance of Standard Time, is kept in some places Map outline © Mountain High Maps Compiled by HM Nautical Almanac Office

STANDARD TIME ZONES

Corrected to November 2001

Zone boundaries are approximate Daylight Saving Time (Summer Time), usually one hour in advance of Standard Time, is kept in some places Map outline © Mountain High Maps Compiled by HM Nautical Almanac Office

ffl N O

td oo

Figure 2.7. World time zone map supplied by H. M. Nautical Almanac Office. Copyright 2001 Council for the Central Laboratory of the Research Councils; used by permission. Because changes are frequent, always check the Internet for current data before traveling to remote areas.

2.5 Slow changes in R.A. and declination

Was this article helpful?

0 0

Post a comment