Commons Content Party

119 readers
1 users here now

Celebrate open culture and the public domain! Post news, memes, and whatever else, as long as it's in the public domain or equivalent license such as Creative Commons.

Commentary, edits, and remixes welcome! Affirmatively stating that any edits/remixes are in the public domain or under a permissive license appreciated.

founded 4 months ago
MODERATORS
1
2
3
4
5
6
 
 

https://commons.wikimedia.org/wiki/File:Bater%C3%ADa_de_Castillitos,_Cartagena,_Espa%C3%B1a,_2022-07-16,_DD_67-69_HDR-Edit.jpg

Description:

View of the coastal artillery site Castillitos, Cartagena, Spain. It was built together with the coastal artillery Cenizas in order to protect the entrance to the Bay of Cartagena in the Mediterranean Sea. The construction took place between 1933 and 1936 following a project from 1926 during the dictatorship of Primo de Rivera. It's a Spanish National Heritage Monument since 1985.

7
8
9
10
11
 
 

https://commons.wikimedia.org/wiki/File:Parco_Regionale_dei_Colli_Euganei_2.jpg

Description:

Euganean Hills are a group of hills of volcanic origin that rise to heights of 300 to 600 m in Veneto, Italy.

12
 
 

https://commons.wikimedia.org/wiki/File:Pig_heads_in_a_market.jpg

Description:

Pig heads in a market. Today is the Feast of Saint Mark. According to legend, ninth century Venetian sailors smuggled Saint Mark's relics out of Muslim-controlled Alexandria by covering them with pork.

13
 
 

https://commons.wikimedia.org/wiki/File:Rapanui_Rock_during_sunset,_Sumner,_Christchurch,_New_Zealand.jpg

Description:

Rapanui Rock during sunset, Sumner, Christchurch, New Zealand

14
 
 

https://commons.wikimedia.org/wiki/File:St._Georg_-_Mundelfingen_-_High_altar_02.jpg

Description:

Saint George; upper altarpiece of the main altar of the parish church St. Georg, built in 1750 - 1751 by Peter Thumb (1681–1767), Hüfingen-Mundelfingen, Baden-Württemberg, Germany. Today is Saint George's Day.

15
16
 
 

https://commons.wikimedia.org/wiki/File:Lupa_Capitolina,_Rome.jpg

Description:

The Capitoline Wolf is a bronze sculpture made by unknown Etruscan sculptors (5th century BC), with the twins Romulus and Remus added in the late 15th century AD, by sculptor Antonio del Pollaiuolo. The sculptural group depicts a scene from the legend of the founding of Rome, occurred on 21 April 753 BC.

17
 
 

https://commons.wikimedia.org/wiki/File:Shepherd_from_Rajasthan_03.jpg

Description:

A shepherd wearing a red turban, smiling and waving in the setting sun at Jawai Bandh in Rajasthan, India.

18
 
 

https://commons.wikimedia.org/wiki/File:Rain_Vortex_Night_Jewel_Changi_Feb23_R16_06856.jpg

Description:

The Rain Vortex at night. The world's largest and tallest indoor waterfall, 40 metres (130 ft) high. In Jewel Changi Airport, Singapore

19
 
 

https://commons.wikimedia.org/wiki/File:Camellia_%C3%97_williamsii_%27Jury%27s_Yellow%27._25-03-2024_(d.j.b.).jpg

Description:

Flower buds of a Camellia × williamsii 'Jury's Yellow'. Focus stack of 16 photos.

20
 
 

https://commons.wikimedia.org/wiki/File:G%C3%BCtenbach,_Teichschlucht_--_2025_--_7668.jpg

Description:

Teichbachtal near Gütenbach/Simonswald, Baden-Württemberg, Germany

21
 
 

https://commons.wikimedia.org/wiki/File:Tibur%C3%B3n_azul_(Prionace_glauca),_canal_Fayal-Pico,_islas_Azores,_Portugal,_2020-07-27,_DD_14.jpg

Description:

Blue shark (Prionace glauca), Faial-Pico Channel, Azores Islands, Portugal. The blue shark is a species of requiem shark, in the family Carcharhinidae, that inhabits deep waters (images taken though between 5 and 10 meter below water) averaging around 3.1 m (10 ft) and preferring cooler waters. They can live up to 20 years, can move very quickly and feed primarily on small fish and squid, although they can take larger prey.

22
 
 

https://commons.wikimedia.org/wiki/File:Kee_monastery_Spiti_Valley_(edited).jpg

Description:

Key Monastery in the northern Indian state of Himachal Pradesh. It is located at an elevation of 4,166 m (13,668 ft) on a hill rising above the Spiti valley, where it is the largest monastery and houses hundreds of monks. It is said to have been founded in the 11th century and belongs to the Gelugpa school of Indo-Tibetan Buddhism. This view shows the monastery in winter, overlooking the snow-covered Spiti river valley with the Himalayas in the background.

23
 
 

https://commons.wikimedia.org/wiki/File:Ilish_Bhaat.jpg

Description:

Smoky hot rice and ilish bhaja with dal chachchori and eggplant fry is a unique combination of Bengali food habits. Today is Bengali new year.

24
 
 

Released into the public domain:

https://www.tomshardware.com/software/original-apollo-11-code-open-sourced-by-nasa-original-command-module-and-lunar-module-code-repos-are-now-public-domain-resources

If you're curious what it looks like, here's a taste:

# Page 1029
# JET SWITCHING LOGIC AND CALCULATION OF REQUIRED ROTATION COMMANDS
#
# DETERMINE THE LOCATION OF THE RATE ERROR AND THE ATTITUDE ERROR RELATIVE TO THE SWITCHING LOGIC IN THE PHASE
# PLANE.
# COMPUTE THE CHANGE IN RATE CORRESPONDING TO THE ATTITUDE ERROR NECESSARY TO DRIVE THE THE S/C INTO THE
# APPROPRIATE DEADZONE.
#
#                                     .
#   R22                          RATE . ERROR
#        WL+H                         .
# *********************************   .					***** SWITCH LINES ENCLOSING DEADZONES
#   R23  WL                        *  .
# ----------------------------------* .					----- DESIRED RATE LINES
#   R23  WL-H       -                *.
# ****************** -                .					R20, R21, R22, ETC REGIONS IN PHASE
#                   * -               .* R18      R20       R21		PLANE FOF COMPUTING DESIRED RESPONSE
#                    *                . *
#                     *-              .  *
#   R22             R24*-    R23      .   *
#                       *             .    *
#                        *            .     *
#                         + -ADB      .      * AF              ATTITUDE
#  ........................+--+---------------+--+........................
#                           AF *      .     +ADB  +             ERROR
#                               *     .            *
#                                *    .            -*
#                                 *   .             -*
#                                  *  .              -*
#                                   * .                *
#                                    *.               - *
#                                     .                - *****************
#                                     .*                -
#                                     . * --------------------------------
#                                     .  *
#                                     .   ********************************
#                                     .

#			FIG. 1	PHASE PLANE SWITCHING LOGIC


# CONSTANTS FOR JET SWITCHING LOGIC

WLH/SLOP	DEC	.00463		# = WL+H/SLOPE = .83333 DEG	$180
WL-H/SLP	DEC	.00277		# = WL-H/SLOPE = .5 DEG		$180
WLH		2DEC	.0011111111	# = WL+H = 0.5 DEG/SEC		$450

WLMH		2DEC	.0006666666	# = WL-H = 0.3 DEG/SEC		$450

WL		2DEC	.0008888888	# = WL   = 0.4 DEG/SEC		$450

# Page 1030
SLOPE2		DEC	.32		# = 0.8 DEG/SEC/DEG		$450/180
JETS		CA	ADB
		AD	FOUR		# AF = FLAT REGION = .044 DEG
		TS	T5TEMP		# ADB+AF
		CAF	TWO
JLOOP		TS	SPNDX
		DOUBLE
		TS	DPNDX
		EXTEND
		INDEX	A
		DCA	ADOT
		DXCH	EDOT
		CA	HOLDFLAG	# HOLDFLAG = +0 MEANS THAT DAP IS IN
		EXTEND			# ATTITUDE HOLD AND RATE DAMPING IS OVER.
		BZF	INHOLD		# IF THIS IS THE CASE, BYPASS ADDITION
					# OF WBODY AND GO TO INHOLD
		EXTEND
		INDEX	DPNDX
		DCS	WBODY
		DAS	EDOT		# = ADOT-WBODY
INHOLD		INDEX	SPNDX
		CA	ERRORX
		TS	AERR		# AERR = BIAS + AK

		CCS	EDOT
		TCF	POSVEL
		TCF	SIGNCK1
		TCF	NEGVEL
SIGNCK1		CCS	EDOT +1
		TCF	POSVEL
		TCF	POSVEL
		TCF	NEGVEL
		TCF	NEGVEL
POSVEL		EXTEND
		DCA	EDOT
		DXCH	EDOTVEL
		CA	T5TEMP
		TS	ADBVEL		# +(ADB+AF)
		CA	AERR
		TS	AERRVEL
		TC	J6.
NEGVEL		EXTEND
		DCS	EDOT
		DXCH	EDOTVEL
		CS	T5TEMP
		TS	ADBVEL		# -(ADB+AF)
		CS	AERR
		TS	AERRVEL

J6.		EXTEND
# Page 1031
		SU	ADB
		AD	WLH/SLOP
		EXTEND
		BZMF	J8

		CS	T5TEMP		# (ADB+AF)
		AD	AERRVEL
		EXTEND
		BZMF	+2
		TCF	J7
		EXTEND
		DCS	EDOTVEL
		EXTEND
		DV	SLOPE
		EXTEND
		SU	AERRVEL
		AD	ADB
		EXTEND
		BZMF	J18
		TCF	J23

J7		CS	WL-H/SLP
		EXTEND
		SU	T5TEMP		# (ADB+AF)
		AD	AERRVEL
		EXTEND
		BZMF	J20
		TCF	J21

J8		EXTEND
		DCS	WLH
		DXCH	WTEMP
		EXTEND
		DCA	EDOTVEL
		DAS	WTEMP
		CCS	WTEMP
		TCF	J22
		TCF	SIGNCK2
		TCF	NJ22
SIGNCK2		CCS	WTEMP +1
		TCF	J22
		TCF	J22
		TCF	NJ22

NJ22		EXTEND
		DCA	EDOTVEL
		EXTEND
		DV	SLOPE
		AD	T5TEMP		# (ADB+AF)
		AD	AERRVEL
# Page 1032
		CCS	A
		TCF	J23
		TCF	J23
		TCF	+2
		TCF	J23

		EXTEND
		DCS	WLMH		# WL - H
		DXCH	WTEMP
		EXTEND
		DCA	EDOTVEL
		DAS	WTEMP
		CCS	WTEMP
		TCF	J23
		TCF	SIGNCK3
		TCF	NJ23
SIGNCK3		CCS	WTEMP +1
		TCF	J23
		TCF	J23
		TCF	NJ23

NJ23		CA	AERRVEL
		AD	T5TEMP		# (ADB+AF)
		AD	WL-H/SLP
		CCS	A
		TCF	J24
		TCF	J24
		TCF	J22
		TCF	J22

J18		EXTEND
		DCS	EDOT
		DXCH	KMPAC
		TCF	JTIME

J20		CS	AERR
		AD	ADBVEL
		EXTEND
		MP	SLOPE2		# (HYSTERESIS SLOPE)
		DXCH	KMPAC
		EXTEND
		DCS	EDOT
		DAS	KMPAC
		TCF	JTIME

J21		CCS	EDOT
		TCF	JP
		TCF	SIGNCK4
		TCF	JN
SIGNCK4		CCS	EDOT +1
# Page 1033
		TCF	JP
		TCF	JP
		TCF	JN
JN		EXTEND
		DCS	EDOT
		DXCH	KMPAC
		EXTEND
		DCA	WL
		DAS	KMPAC
		TCF	JTIME

JP		EXTEND
		DCS	EDOT
		DXCH	KMPAC
		EXTEND
		DCS	WL
		DAS	KMPAC
		TCF	JTIME

J22		CCS	EDOT
		TCF	JN
		TCF	SIGNCK5
		TCF	JP
SIGNCK5		CCS	EDOT +1
		TCF	JN
		TCF	JN
		TCF	JP
		TCF	JP

J23		INDEX	SPNDX
		CS	BIT13		# RESET RATE DAMPING FLAG
		MASK	RCSFLAGS	# BIT13 FOR ROLL  (SPNDX = 0)
		TS	RCSFLAGS	# BIT12 FOR PITCH (SPNDX = 1)
					# BIT11 FOR YAW   (SPNDX = 2)

		INDEX	SPNDX
		CAF	OCT01400	# IS THERE TO BE A FORCED FIRING ON THIS
		MASK	RCSFLAGS	# AXIS
		EXTEND
		BZF	DOJET +2	# NO, GO TO DOJET +2 AND DO NOTHING

		TCF	J18		# YES, GO TO J18 AND FORCE A FIRING

J24		CS	AERR
		EXTEND
		SU	ADBVEL
		EXTEND
		MP	SLOPE2		# (HYSTERESIS SLOPE)
		DXCH	KMPAC
		EXTEND
# Page 1034
		DCS	EDOT
		DAS	KMPAC
25
view more: next ›