Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
The nightime sky looks like a dome we call the ___ ___.
|
celestial sphere
|
|
|
The ___ separates the visible portion of the sky we see from the portion we cannot see.
|
horizon
|
|
|
The point of the celestial sphere directly above an observer is called the ___.
|
zenith
|
|
|
The pointo f the celestial sphere directly below an observer is called the ___.
|
nadir
|
|
|
At the end of the axis of the earth are imaginery poles called the ______ ___ __ and ___ ___ ___.
|
north celestial pole
south celestial pole |
|
|
An imaginery line that encircles the earth at the midway point is called the ___ ____.
|
celestial equator
|
|
|
Another name for the celestial equator is ________.
|
equinoctial
equi- noc-tial |
|
|
The most basic unit of time is the ___.
|
day
|
|
|
There are four kinds of time:
1 2 3 4 |
1. sidereal time
2.apparent solar time 3.mean (avg) solar time 4.standard solar time |
|
|
The ____ is a imaginary line from the north to south pole, used to measure the motion of celestrial objects.
|
meridian
|
|
|
A ___ ___ is defined as one rotation of the earth relative to the stars (23h, 56m, 4s)
|
sidereal day
|
|
|
An __ ___ day is measured from noon to noon; the time it takes the sun to cross the meridian twice. (24h, 00m, 30s)
|
apparent solar day
|
|
|
A __ ___ __ is an average of apparent solar days throughout the year.
|
mean solar day
|
|
|
The difference between mean solar time and apparent solar time is called the __ __ ___.
|
equation of time
"equation meaning correction" |
|
|
In 1884, the world was divided into ____ time zones.
|
24 time zones
|
|
|
The time zones are called __ ___ ___.
|
standard solar time
|
|
|
On the first Sunday in April, we ____ our time one hour to take advantage of the extra daylight hours.
|
advance
|
|
|
On the first Sunday in October, we ____ our time one hour to compensate for the short daylight hours.
|
set back
|
|
|
__ ___ means AM "before noon".
|
ante meridiem
|
|
|
__ ___ means PM "after noon".
|
post meridiem
|
