moon so bright that only the two bright 
planets can be seen near it. Jupiter 
(the brighter) will be to the moon’s 
right, Saturn below. In a short time, 
the moon’s motion will be apparent, 
and the arrangement changes through 
the night as the objects move across 
the sky. The moon passes closest to 
Jupiter at about 8:00 p.m., EST, clos- 
est to Saturn about 1:00 a.m., EST 
(on the 17th). The bright star east 
of them is Spica. 
April 17-18: The moon (one day 
closer to full) is near Spica, with Ju- 
piter and Saturn to their west (right). 
April 20: The moon is at apogee 
(farthest from the earth). 
April 21-22: The Lyrid meteor 
shower, reliable but not particularly 
productive (about 15 meteors per 
hour), is at maximum. Look for me- 
teors after 1:00 a.m. 
April 27: Mercury, at superior con- 
junction, moves to the sun’s left and 
becomes an evening star. 
May 3-4: The perigee moon, coming 
within an hour of new moon, will en- 
hance spring tides tonight and tomor- 
row. The effect of perigee will be much 
stronger than in early April, since it 
comes so close to new moon. The Eta 
Aquarid meteor shower (about 20 per 
hour, but often bright) is at maximum 
on the morning of the 4th. 
May 10-11: The first-quarter moon 
tonight is near Regulus, the brightest 
star in Leo, moving closer to it during 
the night. The moon passes above Reg- 
ulus during the day on the 11th, and 
will be seen moving away from the 
star during that evening. 
May 13-14: The gibbous moon is 
near Jupiter early tonight, passing 
above it at about 10:00 p.m., EST, 
then passing above Saturn. 
of Natural History Mease print 
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in 
Glass set of six 
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Pitcher 
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so please provide street address. 
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r 
Silent 
Safe 
A marvelous opportunity to acquire an early 
model Stirling Cycle Engine and acquaint 
yourself with little known facts about a prod- 
uct of the past that may well hold promise 
for the future. 
The average person has never heard of the 
Stirling engine, so the sight of one quietly 
running with heat as its only fuel will at first 
amaze them and then excite their imagina- 
tion. This is the first in a family of six differ- 
ent desk-top model hot air engines to be 
issued during the next three years. 
Experimenters • Hobbyists’ Power Source 
Students • Collectors • Model Engineers 
ALU METAL 
SPEEDS TO 1000 RPM 
BUILT-IN ALCOHOL BURNER 
An easily read, lavishly illustrated, 128- 
page book accompanies each engine or 
may be purchased separately. This pub- 
lication, the first of its kind, takes the 
reader on a 160-year tour through the 
world of Stirling Cycle Engines. Illus- 
trations include the Stirling, Roper, 
Heinrici and the amazing new Stirling- 
powered Ford Torino! 
The Amazing 
Stirling Cycle 
7 */i " x 4" 
Hot Air Engine 
Heat is the only fuel^^required ! 
L 
Solar Engines • 4020 East McDowell Road. Phoenix, AZ 85008 U.S.A. (602) 273-6191 
p/ease send me Engine and Book @ $38.50. . .$ * 
Book (separately) @ $ 5.50 . . . $ 
Enclosed 
D Check □ Money Order 
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□ American Express □ VISA 
□ Diners □ Master Charge 
INTERBANK NO. 
CARD NO. 
EXPIRATION DATE 
TOTAL $_ 
( Domestic shipments sent postpaid. 
International (airmail) please add: 
$11.00 for Engine ; $2.00 for Book only.) 
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NAME (PLEASE PRINT) 
ADDRESS 
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■ CREDIT CARD BUYERS DIAL: (800) 528-6048 — 
NH-2 
87 
