-- card: 9018 from stack: in.5
-- bmap block id: 9783
-- flags: 0000
-- background id: 6859
-- name: fx
----- HyperTalk script -----
on closeField
  set numberFormat to "0.#"
  put line 1 of card field 7 into c1
  put line 2 of card field 7 into c2
  put line 3 of card field 7 into c3
  put line 5 of card field 7 into c5
  put round(10*c1*c2/c3) into line 4 of card field 7
  put c5/c3*c2 into line 6 of card field 7
  put c5/c3 into line 7 of card field 7
  put round(10*c5*c1*c2/c3) into line 8 of card field 7
end closeField

on empty
  global emptyField
  put -1 into emptyField
  put false into var
  repeat with i=1 to 5
    if line 1 of card field i is empty then
      if var then
        put 0 into emptyField
        exit empty
      end if
      put i into emptyField
      put true into var
    end if
  end repeat
end empty

on opencard
  hide cd fld about
  pass opencard
end opencard

on closecard
  hide cd fld about
  pass closecard
end closecard



-- part 12 (button)
-- low flags: 00
-- high flags: C006
-- rect: left=206 top=104 right=124 bottom=258
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: sec.
----- HyperTalk script -----
on mouseUp
  set hilite of button "sec." to not hilite of button "sec."
  set hilite of button "min." to not hilite of button "sec."
end mouseUp



-- part 14 (button)
-- low flags: 00
-- high flags: C006
-- rect: left=241 top=123 right=143 bottom=309
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: f/ratio
----- HyperTalk script -----
on mouseUp
  set hilite of button "f/ratio" to not hilite of button "f/ratio"
  set hilite of button "cm." to not hilite of button "f/ratio"
end mouseUp



-- part 15 (button)
-- low flags: 00
-- high flags: 8006
-- rect: left=190 top=123 right=143 bottom=242
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: cm.
----- HyperTalk script -----
on mouseUp
  set hilite of button "cm." to not hilite of button "cm."
  set hilite of button "f/ratio" to not hilite of button "cm."
end mouseUp



-- part 18 (button)
-- low flags: 00
-- high flags: 8006
-- rect: left=257 top=104 right=124 bottom=309
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: min.
----- HyperTalk script -----
on mouseUp
  set hilite of button "min." to not hilite of button "min."
  set hilite of button "sec." to not hilite of button "min."
end mouseUp



-- part 22 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=50 top=197 right=219 bottom=75
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Sun
----- HyperTalk script -----
on mouseUp
  put -8 into card field 1
  put "Sun" into card field "Object"
end mouseUp



-- part 24 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=50 top=218 right=239 bottom=114
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Full Moon
----- HyperTalk script -----
on mouseUp
  put 11 into card field 1
  put "Full Moon" into card field "Object"
end mouseUp



-- part 25 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=50 top=238 right=259 bottom=143
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Gibbous Moon
----- HyperTalk script -----
on mouseUp
  put 12 into card field 1
  put "Gibbous Moon" into card field "Object"
end mouseUp



-- part 26 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=50 top=258 right=279 bottom=142
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Quarter Moon
----- HyperTalk script -----
on mouseUp
  put 13.5 into card field 1
  put "Quarter Moon" into card field "Object"
end mouseUp



-- part 27 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=50 top=278 right=299 bottom=151
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Crescent Moon
----- HyperTalk script -----
on mouseUp
  put 14.5 into card field 1
  put "Crescent Moon" into card field "Object"
end mouseUp



-- part 28 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=50 top=298 right=319 bottom=162
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Earthshine Moon
----- HyperTalk script -----
on mouseUp
  put 24.5 into card field 1
  put "Earthshine Moon" into card field "Object"
end mouseUp



-- part 30 (button)
-- low flags: 80
-- high flags: 8000
-- rect: left=50 top=218 right=239 bottom=147
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Central Umbra
----- HyperTalk script -----
on mouseUp
  put 23.5 into card field 1
  put "Moon - Central Umbra" into card field "Object"
end mouseUp



-- part 45 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=145 top=87 right=106 bottom=189
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 3
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 


-- part 31 (button)
-- low flags: 80
-- high flags: 8000
-- rect: left=50 top=238 right=259 bottom=128
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Edge Umbra
----- HyperTalk script -----
on mouseUp
  put 22 into card field 1
  put "Moon - Just within Umbra" into card field "Object"
end mouseUp



-- part 32 (button)
-- low flags: 80
-- high flags: 8000
-- rect: left=50 top=258 right=279 bottom=143
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Partial Umbra
----- HyperTalk script -----
on mouseUp
  put 20 into card field 1
  put "Moon - Partially within Umbra" into card field "Object"
end mouseUp



-- part 33 (button)
-- low flags: 80
-- high flags: 8000
-- rect: left=50 top=278 right=299 bottom=118
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Penumbra
----- HyperTalk script -----
on mouseUp
  put 15 into card field 1
  put "Moon - Penumbra" into card field "Object"
end mouseUp



-- part 34 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=144 top=197 right=219 bottom=240
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Lunar Eclipse
----- HyperTalk script -----
on mouseUp
  if visible of button 11 then
    repeat with i= 6 to 10
      set visible of button i to true
    end repeat
    repeat with i= 11 to 14
      set visible of button i to false
    end repeat
  else
    repeat with i= 11 to 14
      set visible of button i to true
    end repeat
    repeat with i= 6 to 10
      set visible of button i to false
    end repeat
  end if
end mouseUp



-- part 35 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=146 top=218 right=239 bottom=240
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Stars
----- HyperTalk script -----
on mouseUp
  Ask "Faintest Magnitude?"
  put rnd10(4*(it-4.5)/3+9) into card field 1
  put "Stars: Mag. Limit =" && it into card field "Object"
end mouseUp



-- part 36 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=157 top=238 right=258 bottom=240
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Venus
----- HyperTalk script -----
on mouseUp
  put 8 into card field 1
  put "Venus" into card field "Object"
end mouseUp



-- part 37 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=158 top=257 right=278 bottom=240
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Mars @ opp.
----- HyperTalk script -----
on mouseUp
  put 13 into card field 1
  put "Mars @ opp." into card field "Object"
end mouseUp



-- part 47 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=145 top=105 right=124 bottom=200
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 3
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 2


-- part 38 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=158 top=277 right=298 bottom=240
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Jupiter
----- HyperTalk script -----
on mouseUp
  put 13 into card field 1
  put "Jupiter" into card field "Object"
end mouseUp



-- part 39 (button)
-- low flags: 00
-- high flags: 8000
-- rect: left=161 top=298 right=319 bottom=240
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Saturn
----- HyperTalk script -----
on mouseUp
  put 15.5 into card field 1
  put "Saturn" into card field "Object"
end mouseUp



-- part 44 (button)
-- low flags: 00
-- high flags: 2000
-- rect: left=473 top=56 right=88 bottom=509
-- title width / last selected line: 0
-- icon id / first selected line: 2162 / 2162
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 
----- HyperTalk script -----
on mouseUp
  if visible of cd fld about then
    hide cd fld about
  else
    pop card
  end if
end mouseUp




-- part 48 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=145 top=123 right=142 bottom=189
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 3
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 3


-- part 49 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=145 top=141 right=160 bottom=189
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 3
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 4


-- part 50 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=145 top=159 right=178 bottom=189
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 3
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 5


-- part 51 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=188 top=87 right=106 bottom=410
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 3
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Object


-- part 42 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=375 top=173 right=320 bottom=452
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 16
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 


-- part 40 (field)
-- low flags: 00
-- high flags: 4000
-- rect: left=255 top=173 right=320 bottom=372
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 16
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: 


-- part 53 (field)
-- low flags: 80
-- high flags: 0004
-- rect: left=81 top=40 right=145 bottom=430
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 20
-- text size: 24
-- style flags: 0
-- line height: 32
-- part name: Output


-- part 54 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=359 top=124 right=146 bottom=459
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: Calculate
----- HyperTalk script -----
on mouseUp
  global emptyField
  if the selection is not empty then put empty into selection
  empty
  put "1,2,4,8,15,30,60,125,250,500,1000" into dur
  if emptyField is -1 then
    put empty into card field 2
    put 2 into emptyField
  end if
  if emptyField is 0 then
    put return & "Not enough items specified..." into card field "Output"
    flashField 2
    exit mouseUp
  end if
  put line 1 of card field 1 into fx1
  put line 1 of card field 2 into it
  if hilite of button "min." then multiply it by 60
  if char 2 of it is "/" then get value of it
  put 12+log2(it) into fx2
  put 10-2*log2(line 1 of card field 3) into fx3
  if hilite of button "cm." then multiply fx3 by -1
  put log2(line 1 of card field 4)-4 into fx4
  put -10/3*line 1 of card field 5 into fx5
  set numberFormat to "0.#"
  if emptyField is 1 then put fx2+fx3+fx4+fx5 into card field 1
  if emptyField is 2 then
    put exp2(fx1-fx3-fx4-fx5-12) into it
    if it<60 then
      if it<1 then
        get round(1/it)
        repeat with i=1 to 11
          if it<=item i of dur then
            get item i of dur
            exit repeat
          end if
        end repeat
        put "1/" & it into card field 2
      else
        put it into card field 2
      end if
      set hilite of button "min." to false
      set hilite of button "sec." to true
    end if
  else
    divide it by 60
    set hilite of button "min." to true
    set hilite of button "sec." to false
    put it into card field 2
  end if
  if emptyField is 3 then
    put fx1-fx2-fx4-fx5 into it
    if hilite of button "f/ratio"
    then put exp2((10-it)/2) into it
  else put exp2((10+it)/2) into it
  put it into card field 3
end if
if emptyField is 4 then
  put exp2(fx1-fx2-fx3-fx5+4) into card field 4
end if
if emptyField is 5 then
  put 0.3*(fx1-fx2-fx3-fx4) into card field 5
end if
end mouseUp



-- part 55 (button)
-- low flags: 00
-- high flags: 2002
-- rect: left=472 top=22 right=54 bottom=510
-- title width / last selected line: 0
-- icon id / first selected line: 14767 / 14767
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: New Button
----- HyperTalk script -----
on mouseUp
  set scroll of cd fld about to 0
  show cd fld about
end mouseUp



-- part 56 (field)
-- low flags: 80
-- high flags: 0007
-- rect: left=41 top=77 right=323 bottom=469
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 0
-- font id: 20
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: about


-- part contents for card part 40
----- text -----
*Aperture (cm)
*f/ratio
eyepiece fl. (mm)
magnification
camera fl. (mm)
effective f/ratio
big M
effective fl.

-- part contents for card part 42
----- text -----
25.4
10
15
169
50
33.3
3.3
8467

-- part contents for card part 50
----- text -----
0

-- part contents for card part 49
----- text -----
400

-- part contents for card part 45
----- text -----
13

-- part contents for card part 48
----- text -----
33

-- part contents for card part 51
----- text -----
Mars @ opp.

-- part contents for card part 53
----- text -----

All items specified...

-- part contents for card part 47
----- text -----
1/60

-- part contents for card part 56
----- text -----
This card allows one to calculate exposure times for astronomical photographs.  One may supply four of the five exposure criteria and the missing one will be calculated.  Since exposure time is the most common calculation, it is calculated if all five parameters are present.  Click on Calculate button to calculate.
   A filter of 0 corresponds to no filter.
   Clicking on the object gives the correct average fx value for that object (except Mars, which is at opposition).  Asking for star exposure times, a limiting magnitude is requested.
   Clicking on the Lunar Eclipse button gives fx values for the eclipsed moon rather than the uneclipsed moon.
   For the aperture button, one must use f/ratio when photographing extended objects (objects which show a disk, such as planets) and cm. aperture when photographing other objects (stars).
   One can enter telescope data for calculation of magnification and effective ratio by entering the proper telescope values.  The starred values will remain given for one telescope.  Press the Enter key to calculate.

These equations and the fx idea appeared first in Barry Gordon's book, The fx System of Astrophotograpy.