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本帖最后由 精打细算 于 2012-8-11 16:36 编辑
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5 w o! `8 P/ q+ ?0 }To anybody interested, we are joining RASC Royal Astronomical Society of Canada for a night of meteor shower, once a year event that peaks tonight Aug 11-12, at Blackfoot Darksite.4 q6 `! l, A7 F8 R
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Tonight is just right - clear sky, and possibly seeing Comet Swift-Tuttle that obits the sun once every 133 years. Bring snack and tent.. lay down.. and watch the show... it should be fun... but be there before 10pm... or people will be pretty upset with late comers.... Bring you telescope too.. and some bug spray...
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# U# w( m0 v) t( J8 T# r* y- ~0 f, e+ VSome rules...8 U8 z4 M: Z3 ?4 ^7 A9 U
, t. A4 s& C* CEtiquette For Dark Sites9 x! l% ^5 T, v4 L9 N; p: D1 d5 D
When approaching a known dark site it is considered good etiquette to turn off / disable / cover-up exterior vehicle headlights and pause to let your eyes adjust to the darkness for about 5-10 minutes (if you arrive after sunset).
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2 Y8 i% L+ x) N% ]$ G& W4 k6 LPlease note that it is illegal to drive your vehicle after dark with no lights on, so we cannot insist that you to do it.3 M) \. c7 O9 B6 w& i- l
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You may also want to take the time to disable ALL your interior lights. If you can't, just be sure to honk or yell "White Light!" a few seconds before you open the doors when you are at the site.+ q! e8 r c) ~& P4 x- O
% } y/ p1 ?) l' _6 l# LIf you cannot turn your running lights off,please honk your horn before coming any further. One trick to turning off your running lights, that may work on some vehicles, is to put your parking brake on slightly. You could also make some covers out of thick red fabric and mount this over the lights with magnets (don't forget to take them off again when you leave).: Q+ j4 h( i5 r3 b
O e+ {6 X- }3 h( B5 X iMany of us bring a red flashlight to illuminate the road as we come in, others gain the assistance of other already dark adapted people to guide us in with their red lights.
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+ J# X4 N( k( {: ^It best to usually park at the gate for 5-10 minutes at least and let your eyes dark adapt. Then roll down your window down and use a red flashlight to illuminate the road slightly. The open window allows you to hear better and you can lean out the window to see better. Also, come to a complete stop just before you enter the staging area and do a quick walk around to locate everybody and their equipment and choose a suitable parking spot. Most park so they can drive out without backing up as backup lights are white, and a minimum of brake lights (they're very bright too, even if they are red).
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Additional Etiquite For Dark Sites
& {0 J6 b7 n3 p9 O7 c: f1 b+ jNo Smoking on the Observing Field3 r# K. V% F* B
Smoke damages telescope optics and can cause sensitive individuals to suffer allergic reactions. If you do smoke please try to smoke away from other (non-smoking) observers out of respect. Lighters cause dark adapted eyes to become ruined.
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No Aerosol Sprays on the Observing Field6 E1 h0 K9 e, u: H+ G
One drop of spray can permanently damage telescope optics. Please do not apply insect repellent spray or use any other aerosol spray on the observing field. Lotions and roll-ons are fine.0 a8 J2 }+ L5 u/ Z4 r
, s% S" L( L. c1 q4 vNo White Lights After Dusk. n: l/ x, W2 x# @
White light ruins the dark adaptation that your eyes develop after about 20 or 30 minutes in the dark. You will need this dark adaptation to see faint, deep sky objects. When a white light is used after dark anywhere in the vicinity of the observing field (flashlights, car headlights, even a match) it takes up to 30 minutes for everyone to regain their night vision. Once your eyes adapt to the darkness, you will be able to find your way around and avoid obstructions without needing a flashlight.* r `/ _5 f/ J. v
# J3 ]) L+ A m" K1 o5 Y% UTurn off Your Headlights and Interior Lights
) b2 K! A/ d3 n4 kWhen you arrive at an observing site after dark, please turn off your car's headlights before entering the parking areas. When you leave an observing site after dark, please do not turn on your car's headlights until after you exit the parking area. Also, please ensure that any non-red interior and trunk lights will not come on when a door is opened. If your car's courtesy lights cannot be deactivated with a switch, please cover the lights with a piece of cloth or paper bag.. ]/ S* ?9 L% J. V$ V
0 |4 N( M5 _8 R4 g; _No Flash Photography
: o# r2 u: J" j. uA camera flash can destroy everyone's night vision for some time and can also ruin astrophotography that may be happening. Snapshots taken under dark conditions, even with a flash, generally do not turn out well anyway, unless you're using special camera settings.
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1 A9 v2 I2 s7 e( \+ s5 z4 nWatch Your Children8 g( {# Y( |; D- q5 o9 a3 O* ?
Children are always welcome at all of our outings. But since the observing field is dark, small children are more likely to trip and get hurt, become lost, or bump into and damage expensive equipment.# e3 o" i# D C; C- M" t
' v s. y8 a) j) o4 ]5 pAsk Before Touching, x! g: k, C0 h0 ~* I
Some astronomers may be adjusting their equipment or doing delicate astrophotography, or the telescope may not be aimed at any object in particular. So, please ask before touching or moving a telescope or other equipment.( [: M3 a2 E; O8 v; U" k
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发表于 2012-8-11 15:35
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