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P719 CEEFAX 719 Sun 22 Dec 16:42/12 |B2201209|a16HALLEY|i24BBBC332k|m40000÷e ÷X÷b÷f÷L HALLEY÷e÷X÷l÷] ÷e÷X÷v÷b÷Jsjtu p÷e÷X(÷] ÷e÷X2÷]÷M÷e÷X<÷^÷C7÷e÷XF÷k÷G 23 ,1,0;0;0;0;÷i÷XP÷] ÷e÷XZ=÷I —e(129);—e(1 57);—e(131);"Altitude and Azimuth of Hal ley's"÷e÷Xd6÷I —e(129);—e(157);—e(131);" Comet and the sun between"÷e÷Xn@÷I —e(12 9);—e(157);—e(131);"January 1 1985 and D ecembjt 31 1986"÷e÷Xx÷i÷G28 0,24,39,3÷e÷ X—*÷] ÷e÷X—4÷]÷3÷e÷X—>÷a÷Jinit÷e÷X—H÷b÷J enter÷e÷X—R÷|—÷Jsun÷e÷X—\÷b÷Jcomet÷e÷X—f ÷b÷Jjarth÷e÷X—p÷] ÷e÷X÷*÷]÷3÷e÷X÷4÷d÷Jut ndata÷i÷X÷>÷f÷Jcomjtdata÷e÷X÷H÷] ÷e÷X÷R' ÷I'—e(131);"Graphic display? (Y/N) ";÷e÷ Y÷\%÷? —Lzn=—?("Y") ÷C4:÷Jgraphic —3 ÷G1 1,13÷e÷Y÷f÷] ÷e÷Y÷p*÷I'—e(131);"Repeat? (Y/N) ";÷e÷Y"÷h÷U —Lzn=—?("N ")÷e÷Y,÷] ÷e÷Y6÷^÷C7÷e÷Y@÷]÷8÷e÷YJ÷] ÷e÷ YT÷c÷5÷Jsetup÷e÷Y^4÷6 A(5):÷6 B(5):÷6 C( 5):÷6 D(5):÷6 E(5):÷6 F(5):÷6 G(5)÷e÷Yh. ÷6 H(5):÷6 I(5):÷6 K(5):÷6 L(5):÷6 M(12) :÷6 N(5)÷e÷Yr&÷6 P(5):÷6 Q(5):÷6 R(5):÷6 S(5):÷6 T(5)÷e÷Y||-÷6 U(5):÷6 V(5):÷6|c

P719 CEEFAX 719 Sun 22 Dec 16:41/12 |B2202209|a16HALLEY|i24BBBC332k|m402B1 W (5):÷6 X(5):÷6 Y(5):÷6 Z(5)÷e÷Y—.÷]÷9÷e÷ Y—8÷] ÷e÷Y—B÷b÷5÷Jinit÷e÷Y—L÷u÷L CUMUL ATJVE MONTH DAYS÷i÷Y—V÷b÷O —5dBA÷e÷Y—|—÷ q÷; I%=1 —|— 12:÷K M(I%):÷E÷e÷Y—j0÷4 0,3 2,59,90,120,151,181,212,243,273,304,334÷ e÷Y—t÷] ÷e÷Y÷.÷o÷L COMET CONSTANTS÷e÷Y ÷8&E(1)=0.967:W(1)=170.011:A(1)=17.94÷e÷ Z÷B÷uZ(1)=58.1530:I(1)=162.238÷e÷Y÷L÷] ÷ j÷Y÷V÷m÷L SUN CONSTANTS÷e÷Z÷|—.W(2)=28 2.510396:G(2)=279.041470:O=—Z(23.44)÷e÷Z ÷j÷] ÷e÷Z÷t÷o÷L EARTH CONSTANTS÷e÷Z&-E (3)=0.01672:W(3)=102.51044:G(3)=99.53431 ÷e÷Z0÷] ÷e÷Z:÷o÷L OTHER CONSTANTS÷e÷ZD ÷qA=0.065709:C=1.002743÷e÷ZN÷]÷9÷e÷ZX÷] ÷e÷Zb÷c÷5÷Jjnter÷e÷Zl.÷I'—e(134);"Latest de of observer in degrees"÷e÷Zv7÷I —e(13 4);"(0-90, + for North, - for South)";—e (135);÷i÷Z—(÷sLAT=—Linput(0,0,-90,90)÷e÷ Z—2÷dL=—Z(LAT*÷e÷Z—<÷] ÷e÷Z—F*÷I'—e(134) ;"Year (1985 or 1986)";—e(135);÷e÷Z—P!Y$ =—k(—Linput(-1,-1,1985,1986))÷e÷Z—Z+÷? Y $="1985" —4 B=17.359625 —3 B=17.37554|c

P719 CEEFAX 719 Sun 22 Dec 16:12/13 |B2203209|a16HALLEY|i24BBBC332k|m4058E0÷ e÷Z—d÷] ÷e÷Z—n,÷I'—e(134);"Month (1 for January...12 for"÷e÷Z÷( ÷I —e(134);"Dice mber)";—e(135);÷e÷Z÷2÷pN=—Linput(-1,-1,1 ,12)÷e÷Z÷<÷] ÷e÷Z÷F*÷I'—e(134);"Day of m onth (1-31)";—e(135);÷e÷Z÷P÷pD=—Linput(- 2,-1,1,31)÷e÷[÷Z÷] ÷e÷[÷d"÷I'—e(134);"Ho ur (0-23)";—e(135);÷e÷[÷n÷pH=—Linput(-1, -1,0,23)÷e÷[ ÷] ÷e÷[*$÷I'—e(134);"Minute (0-59)";—e(135);÷e÷[4÷pM=—Linput(-1,-1, 0,59)÷e÷[>÷]÷9÷e÷[H÷] ÷e÷[R÷a÷5÷Jsun÷e÷[ \G÷? Y$="1985" —4 X=3653+M(N)+D+(H+M/60) /24 —3 X=4018+M(N)+D+(H+M/60)/24÷e÷[f÷jV =360*XO365.25÷e÷[p÷]÷M÷e÷[z÷s÷? V<0 —, V >360 —4 V=V-360÷i÷[—,÷k÷U V>=0 —( V<=360 ÷e÷[—6÷iY=V+G(2)-W(2)÷e÷[—@÷j÷?Y<0 —4 Y= Y+360÷e÷[—J÷bY=—Z(Y)÷e÷[—T÷nE=(360*E(3)* —] Y)/—W÷e÷[—^÷iL(2)=V+E+G(2)÷e÷[—h÷v÷? L(2)>360 —4 L(2)=L(2)-360÷e÷[—r÷iL(2)=—Z (L(2))÷e÷[÷,÷nD(2)=—@(—] O*—] L(2))÷i÷[ ÷6÷qR(2)=—=(—C L(2)/—C D(2))÷e÷[÷@÷v÷? — C OT—] L(2)>0 —4 R(2)=R(2)÷e÷[÷J"÷? —C O *—] L(2)<0 —4 R(2)=2*—W-R(2)÷e÷[÷T÷]÷9|c

P719 CEEFAX 719 Sun 22 Dec 16:31/44 |B2204209|a16HALLEY|i24BBBC332k|m40855÷e ÷\÷^÷] ÷e÷\÷h÷e÷5÷Jsundata÷e÷\÷r£÷I —e(1 31);"LATITUDE:";—e(135);LAT÷e÷\$K÷I —e(1 31);"DATE:";—e(135);D;".";N;".";Y$ —218) —e(131);"TIME:"—e(135);H;":";M÷e÷\.÷t÷I' —e(131);"DATA FOR SUN:"÷e÷\8÷k÷Jdec(R(2) ,D(2))÷e÷\B÷gX(5)=H+M/60÷i÷\L÷gN(5)=M(N) +D÷e÷\V÷pP(5)=N(5)*A-B+X(5)*C÷e÷\|—÷t÷? P(5)>24 —4 P(5)=P(5)-24÷e÷\j÷s÷? P(5)<0 —4 P(5)=P(5)+24÷e÷\t÷qH(2)=—Z (P(5)*15)- R(2)÷e÷\|÷÷oH(5)=H(2):D(5)=D(2)÷e÷\—0÷c÷ Jay#alt÷e÷\—:+V(2)=V(5):U(2)=U(5):K(2)=V X2):Q(2)=U(2)÷e÷\—D÷k÷Jalt(V(2),U(2))÷e÷ \—N+÷? —E(U(2))>-18 —4 ÷I'—e(129);"Sky n ot dark"÷e÷\—X÷]÷9÷e÷\—b÷] ÷e÷\—l÷c÷5÷Jc omit÷e÷\—v!F=360*(X-4058.66)/(365.25*76) ÷e÷\÷0÷k÷? F<0 —4 F=F+360÷e÷\÷:÷]÷M÷e÷\÷ D÷s÷? F<0 —, F>360 —4 F=F-360÷e÷\÷N÷k÷U F>=0 —( F<=360÷e÷]÷X÷bF=—Z(F)÷e÷]÷b÷#Q=F ÷e÷]÷l÷]÷M÷e÷]÷v÷kF(1)=Q-E(1)*—] Q÷e÷](÷ gT=—<(F-F(1))÷e÷]25÷? T>=0.0001 —4 C(1)= (F-F(1))/(1-E(1)*—C Q):Q=Q+C(1)÷e÷]<÷f÷U T<0.0001÷e÷]F!G=—^((1+E(1))/(1-E(1))|c

P719 CEEFAX 719 Sun 22 Dec 16:14/12 |B2205209|a16HALLJY|i24BBBC332k|m40B25)* —#(Q/2)÷e÷]P÷pN(1)=—A G:N(1)=2*N(1)÷e÷]Z *W(1)=—Z(W(1)):Z(1)=—Z(Z(1)):I(1)=—Z(I(1 ))÷e÷]d÷jL(1)=N(1)+W(1)÷e÷]n*R=(A(1)*(1- J(1)*E(1)))/(1+E(1)*—C N(1))÷e÷]x÷jG(1)= L(1)-Z(1)÷e÷]—*÷qP(1)=—@(—] G(1)*—] I(1) *÷e÷]—4÷vL(4)=—A(—# G(1)*—C I(1))+Z(1)÷e ÷]—>)÷? G(1)>—W/2 —( G(1)<3*—W/2 —4 L(4) =L(4)+—W÷e÷]—H÷t÷? L(4)<0 —4 L(4)=L(4)+2 *—W÷e÷]—R÷fS=RT—C P(1)÷e÷]—\÷]÷9÷e÷]—f÷] ÷e÷]—p÷c÷5÷Jjarth÷e÷]÷*÷vV=(360*X*/(365 .25*1.00004)÷e÷]÷4÷]÷M÷e÷]÷>÷s÷? V<0 —, V>360 —4 V=V-360÷i÷]÷H÷k÷U V>=0 —( V<=36 0÷e÷]÷R÷lY(3)=V+G(3)-W(3)÷e÷^÷\÷hY(3)=—Z (Y(3))÷e÷^÷f£L(3)=V+(360*E(3)*—] Y(3))/— W+G(3)÷i÷^÷p÷t÷? L(3)<0 —4 L(3)=L(3)+360 ÷e÷^"÷v÷? L(3)>360 —4 L(3)=L(3)-360÷e÷^, ÷iL(3)=—Z (L(3))÷e÷^6÷iW(3)=—Z (W(3))÷e÷ ^@÷jN(3)=L(3)-W(3)÷e÷^J&S(3)=(1-E(3)*E(3 ))/(1+E(3)*—C N(3))÷e÷^T÷jDIFF=L(3)-L(4) ÷e÷^^:÷? S<S(3) —4 L(5)=—W+L(3)+—A((S*—] (DIFF))/(S(3)-S*—C(DIFF)))÷e÷^h=÷? S>S(3 ) —4 L(5)=—A((S(3)*—](-DIFF))/(S-S(3)|c

P719 CEEFAX 719 Sun 22 Dec 16:37/28 |B2206209|a16HALLJY|j44BBBC332k|m40E01*— C(-DIFF)))+L(4)÷e÷^r÷t÷? L(5)<0 —4 L(5)= L(5)+2*—W÷e÷^||7B(3)=—A((S*—# P(1)*—](L( 5)-L(4)))/(S(3)*—](L(4)-L(3))))÷e÷^—.(D( 1)=—@(—] B(3)*—C O+—C B(3)*—] O*—] L(5)) ÷e÷ —8 R(1)=—=(—C B(3)*—C L(5)/—C D(1))÷ j÷^—B1÷? -—] O*—] B(3)+—C O*—C B(3)*—] L (5)>0 —4 R(1)=R(1)÷e÷^—L5÷? -—] O*—] B(3 )+—C O*—C B(3)*—] L(5)<0 —4 R(1)=2*—W-R( 1)÷e÷^—V÷]÷9÷e÷^—|—÷] ÷e÷^—j÷g÷5÷Jcomjtd ara÷e÷^—t'÷I'—e(131);"DATA FOR HALLEY'S COMET:"÷e÷^÷.÷k÷Jdec(R(1),D(1))÷e÷^÷8÷pH (1)=—Z(P(5)*15)-5(1)÷e÷^÷B÷oH(5)=H(1):D( 5)=D(1)÷e÷^÷L÷c÷Jay#alt÷e÷^÷V+V(1)=V(5): U(1)=U(5):K(1)=V(1):Q(1)=U(1)÷e÷#÷|—÷k÷J alt(V(1),U(1))÷e÷#÷j÷]÷9÷e÷#÷t÷] ÷e÷#&÷e ÷5÷Jgraphic÷e÷#0£T(1)=—A((Q(1)-Q(2))/(K( 2)-K(1)))÷e÷#:)÷? K(2)<K(1) —( Q(1)>Q(2) —4 T(1)=T(1)+—W÷i÷#D)÷? K(2)<K(1) —( Q( 2)>Q(1) —4 T(1)=T(1)+—W÷e÷#N£C=(80/R**—C T(1):D=(80/R**—] T(1)÷e÷#X÷]÷3÷e÷#b÷l÷D 10,10:÷7 910,10÷i÷#l÷l÷D 10,10:÷7 10,91 0÷e÷#v!÷G23,241,240,240,240,0,0,0,0,0|c

P719 CEEFAX 719 Sun 22 Dec 16:41/29 |B2208209|a16HALLEY|i24BBBC332k|m4135D1 —4 ÷I —i(69)÷e÷|—÷@÷k÷? J=2 —4 ÷I —e(83) ÷e÷|—÷J÷k÷? J=3 —4 ÷I —e(87)÷e÷|—÷T÷k÷? J=4 —4 ÷I —e(78)÷e÷a÷^÷g÷D K(4),Q(4)÷e÷a ÷h÷k÷7 K(4)-C,Q(4)+D÷e÷a÷r÷]÷9÷e÷a$÷] ÷e ÷a.÷|—÷5—Lzn÷e÷a8÷#÷B G÷e÷aB÷]÷M÷e÷aL÷eG =—M —( 223÷e÷aV÷i÷U G=89 —, G=78÷e÷a|—÷^ =G÷e÷aj÷] ÷i÷at÷f÷5÷Jdec(r,d)÷e÷a|÷÷e@%= &20206÷i÷a—06÷I'—e(134);"Right Ascension :";—e(135),—E(r);" degrees"÷e÷a—:3÷I —e( 234);"Declination:";—e(135), —E(d);" deg tees"÷e÷a—D÷a@%=10÷e÷a—N÷]÷9÷e÷a—X÷] ÷e÷ a—b÷f÷5÷Jalt(v,u)÷e÷a—l÷e@%=&20206÷e÷a—v 3÷I'—e(134);"Azimuth: ";—e(135),—E(v );" degrees"÷e÷a÷03÷I —e(134);"Altitude: ";—e(135),—E(u*;" degrees"÷e÷a÷:÷a@% =10÷e÷a÷D÷]÷9÷e÷a÷N÷] ÷e÷b÷X÷i÷5 —Lcheck ascii÷i÷b÷b÷c÷B valid÷e÷b÷l÷cvalid=—K÷e÷ b÷v6÷? —T integer —( point=—K —( —e(X)=" ." —4 valid=—a:point=—a÷e÷b(@÷? —T posit ivj —( —Q(entry$)=0 —( (—e(X)="+" —, —e( X*="-") —4 valid=—a÷e÷b2%÷? —e(X*>="0" — X —i(X*<="9b —4 vblid=—a÷e÷b<÷k÷? —T |c

P719 CEEFAX 719 Sun 22 Dec 16:40/21 |B2209209|a16HALLEY|i24BBBC332k|m415FFva lid —4 ÷G 7÷e÷bF÷b=valid÷e÷bP÷] ÷e÷bZ&÷5 —Linput(integer,positive,min,max)÷e÷bd$ ÷L (-1,-1) for positive integer÷e÷bn÷] ÷e÷bx÷r÷B entry$,X,last$,point÷e÷b—*÷]÷ M÷e÷b—4÷eentry$=""÷e÷b—>÷]÷M÷e÷b—H÷cpoin t=—K÷e÷b—R÷]÷M÷e÷b—\÷#X=—M÷e÷b—fd÷? X=12 7 —( —Q(entry$) —4 ÷I —e(X);:last$=—jink ry$,1):entry$=—hjntry$,—Q(entry$)-1):÷? last$="." —4 point=—K÷e÷b—pA÷? X<>13 —( X<>127 —4 ÷? —Lchjckascii —4 entry$=entr y$+—e(X):÷I —e(X);÷e÷b÷*÷b÷U X=13÷e÷b÷4: ÷U entry$<>"-" —( entry$<>"+" —( entry$< >"" —( entry$<>"."÷e÷b÷>C÷? —c(entry$)<m in —, —c(entry$)>max —4 ÷G7:÷; I%=1 —|— —Q(entry$):÷G 127:÷E÷e÷b÷H%÷U —c(entry$) >=min —( —c(entry$)<=max÷e÷b÷R÷]÷I÷e÷c÷\ ÷f=—c(entry$)÷e÷W|c