27 # Page 785
28 BANK 32
29 SETLOC F2DPS*32
30 BANK
31
32 EBANK= E2DPS
33
34 # *************************************
35 # P63: THE LUNAR LANDING, BRAKING PHASE
36 # *************************************
37
38 COUNT* $$/P63
39
40 P63LM TC PHASCHNG
41 OCT 04024
42
43 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
44 CADR R02BOTH
45
46 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
47 TS WHICH
48
49 CAF DPSTHRSH # INITIALIZE DVMON
50 TS DVTHRUSH
51 CAF FOUR
52 TS DVCNTR
53
54 CS ONE # INITIALIZE WCHPHASE AND FLPASS0
55 TS WCHPHASE
56
57 CA ZERO
58 TS FLPASS0
59
60 CS BIT14
61 EXTEND
62 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
63
64 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
65 CLEAR CLEAR
66 NOTHROTL
67 REDFLAG
68 CLEAR SET
69 LRBYPASS
70 MUNFLAG
71 CLEAR CLEAR
72 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
73 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
74
75 # ********************************
76
77 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
78 # Page 786
79 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
80 RLS # AT 6D ESTIMATED TIME OF LANDING
81 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
82 TLAND
83 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
84 RP-TO-R
85 VSL4 MXV
86 REFSMMAT
87 STCALL LAND
88 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
89 DLOAD DSU
90 TLAND
91 GUIDDURN
92 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
93 LEMPREC
94 SSP VLOAD
95 NIGNLOOP
96

27 # Page 785
28 BANK 32
29 SETLOC F2DPS*32
30 BANK
31
32 EBANK= E2DPS
33
34 # *************************************
35 # P63: THE LUNAR LANDING, BRAKING PHASE
36 # *************************************
37
38 COUNT* $$/P63
39
40 P63LM TC PHASCHNG
41 OCT 04024
42
43 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
44 CADR R02BOTH
45
46 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
47 TS WHICH
48
49 CAF DPSTHRSH # INITIALIZE DVMON
50 TS DVTHRUSH
51 CAF FOUR
52 TS DVCNTR
53
54 CS ONE # INITIALIZE WCHPHASE AND FLPASS0
55 TS WCHPHASE
56
57 CA ZERO
58 TS FLPASS0
59
60 CS BIT14
61 EXTEND
62 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
63
64 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
65 CLEAR CLEAR
66 NOTHROTL
67 REDFLAG
68 CLEAR SET
69 LRBYPASS
70 MUNFLAG
71 CLEAR CLEAR
72 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
73 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
74
75 # ********************************
76
77 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
78 # Page 786
79 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
80 RLS # AT 6D ESTIMATED TIME OF LANDING
81 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
82 TLAND
83 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
84 RP-TO-R
85 VSL4 MXV
86 REFSMMAT
87 STCALL LAND
88 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
89 DLOAD DSU
90 TLAND
91 GUIDDURN
92 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
93 LEMPREC
94 SSP VLOAD
95 NIGNLOOP
96

PRO (proceed) runs the next line.

Land Apollo 11 on the code that flew it.

Weavers' Moon will run the real 1969 guidance software in your browser. You key in the commands. It flies the descent, until you decide to take over.

I want early access!

First beta: available shortly.
Opens your email app. Or write to hello@weaversmoon.com.

Mission badge: the Moon among stars, with a copper wire threaded through three cores down to a landing mark in the Sea of Tranquillity. Lettered round the edge: Weavers' Moon and Project Textrices; on a ribbon: Luna Textricum.

Behind this text: Luminary 099, The Lunar Landing, page 785, as assembled on 14 July 1969. Real code, public domain.

Weavers' Moon is built on Luminary 099, the program that landed Eagle on 20 July 1969, unchanged. It ran on the Apollo Guidance Computer (AGC), which the crew worked through a keypad and display called the DSKY. In the beta, an emulator called yaAGC, a program that behaves exactly like the original computer, will run it in your browser. A simulated lunar module will give it something to fly: accelerometers, gimbal angles, landing radar, a throttle and sixteen thrusters.

# P63: THE LUNAR LANDING, BRAKING PHASE PROG lights 63: the braking program is running and planning the burn.

# THIS IS THE "PLEASE ENABLE ENGINE"# DISPLAY; IT IS INITIATED AT TIG-5 SEC. VERB 99 flashes until you press PRO. Then the engine lights, and the display becomes VERB 06 NOUN 63 while the computer flies.

R1 Absolute value of velocity
R2 Time to ignition
R3 Delta V, accumulated

# 01202 EXECUTIVE OVERFLOW - NO CORE SETS The PROG lamp lights. Keying VERB 05 NOUN 09 shows the code: more work than the computer can schedule, so it sheds the least important and keeps flying.

R1 Alarm code

# NO. HAS THE ROD SWITCH BEEN "CLICKED"?# YES. SWITCH INTO THE ROD MODE. One click of the rate-of-descent switch hands you the descent. P66 holds the rate you set while you steer.

R1 Horizontal velocity
R2 Altitude rate
R3 Computed altitude

Before it flew, this program was woven. At Raytheon's plant in Waltham, Massachusetts, women threaded copper wire through or around tiny magnetic cores, one wire at a time. Through a core meant 1; around it meant 0. A single misplaced wire changed the program, so every rope was inspected before it flew.

Their names were rarely recorded. Weavers' Moon is named for them: Luna Textricum, the moon of the women who weave.

Weave one word

The listing at the top of this page holds the constant OCT 04024, an octal number: each digit runs from 0 to 7. Weave it into these cores, one group of three per digit.

Press a core to drop it onto the wire, so the wire passes through it. The cores you press in a group must add up to the digit above it. Leave the rest lifted: the wire goes around them, and they count nothing.

Digit 1: weave 0

Leave lifted

Digit 2: weave 4

Make 4

Digit 3: weave 0

Leave lifted

Digit 4: weave 2

Make 2

Digit 5: weave 4

Make 4

Target: OCT 04024 Your word: OCT 00000

0 of 3 digits woven. Digits 1 and 3 are 0: leave those cores lifted.

I want early access!

The beta is planned to have a weaving level, where the computer runs what you wove.

One simulator will run the computer and the lunar module. Every device joins it by role: a keypad and display, a hand controller, or the view out of the window. You'll be able to use one, or all of them at once.

This browser: Keyboard, mouse or touch, with nothing to install.
Your phone: A DSKY in your hand, or tilt it to steer.
A Raspberry Pi DSKY: Built in LEGO or a 3D-printed case.
A gamepad or joystick: The hand controller.
A second screen: The view out of the window.

Crew procedure: Key the real procedure, from the pre-descent data to touchdown. VERB 37 ENTER 63 ENTER selects the braking program, P63.
Armstrong: The computer is heading for a boulder field. Find somewhere better and fly there. In P64, NOUN 64 shows the time left to choose a new spot and the angle to look along.
Fide Machinae: By trust in the machine: the 1202 alarm, as it happened. 102:38:30, “It's a 1202.” 102:38:53, “We're Go on that alarm.”
Quick landing: Start low and land it by hand. P66: each click of the rate-of-descent switch changes how fast you come down.
Weaving: Weave words of rope yourself, then fly what you wove. OCT 04024: the word you weave above. The landing-confirmation program, P68, begins with it too.

Weavers' Moon is for anyone who wants to land on the Moon, and for classes learning how a computer, and the people who built it, got Apollo 11 there. The weaving puzzle above works as a lesson starter today.

No accounts: The beta is planned so that nobody signs up to play. Pupils won't need an email address.
Nothing collected: This site sets no cookies and collects nothing about you. The game will collect only what it needs to run.
Devices: A school laptop or tablet with a current browser. A phone, gamepad or Raspberry Pi is optional.
Who should email: Teachers and parents, for a class or a child. Young players: ask an adult to email for you.

102:33:11 ALDRIN Ignition. P63: the computer flies the braking phase
102:38:26 ARMSTRONG Program alarm.
102:38:30 ARMSTRONG It's a 1202. the computer is overloaded, and keeps flying
102:38:53 DUKE We're Go on that alarm. Houston trusts the computer
102:45:02 DUKE 60 seconds. fuel left; Armstrong is flying by hand in P66
102:45:40 ALDRIN Contact light. a probe under a footpad touches the Moon
102:45:58 ARMSTRONG Houston, Tranquility Base here. The Eagle has landed. P68: landing confirmation

The last 13 minutes of Apollo 11's descent, from the air-to-ground transcript. Times are mission elapsed time, from the Apollo 11 Lunar Surface Journal.

Fly it first.

The first beta will be available shortly. Email us and we'll tell you when it opens.

I want early access!

hello@weaversmoon.com

Tell us whether you're a teacher, a maker or a family.

# ASTRONAUT: NOW LOOK WHERE YOU ENDED UP P68, landing confirmation. VERB 06 and NOUN 43 flash with latitude and longitude: drawn here for Tranquility Base, 0.67° N, 23.47° E. Altitude not shown.

Land Apollo 11 on the code that flew it.

The real computer flies

Woven by hand

Weave one word

Any cockpit

Planned missions

For classrooms and families

Fly it first.

Land Apollo 11 on the code that flew it.

# *************************** # The real computer flies # ***************************

# ***************** # Woven by hand # *****************

Weave one word

# *************** # Any cockpit # ***************

# ******************** # Planned missions # ********************

# ******************************* # For classrooms and families # *******************************

Fly it first.

The real computer flies

Woven by hand

Any cockpit

Planned missions

For classrooms and families