A celestial map that plots stars on a sky projection (stereographic or azimuthal equidistant) with constellation stick-figure lines connecting notable stars. Star apparent magnitudes are represented by point size (brighter stars appear larger), and a coordinate grid overlays the chart for orientation. The dark background mimics a night sky, making this an intuitive tool for identifying constellations and planning observations.
""" anyplot.ai
star-chart-constellation: Star Chart with Constellations
Library: plotly 6.8.0 | Python 3.13.14
Quality: 90/100 | Updated: 2026-06-17
"""
import os
from collections import defaultdict
import numpy as np
import plotly.graph_objects as go
# Theme-adaptive chrome (Imprint tokens)
THEME = os.getenv("ANYPLOT_THEME", "light")
if THEME == "light":
PAGE_BG = "#FAF8F1"
ELEVATED_BG = "#FFFDF6"
INK = "#1A1A17"
INK_SOFT = "#4A4A44"
INK_MUTED = "#6B6A63"
LINE_COL = "rgba(74,74,68,0.52)"
GRID_COL = "rgba(26,26,23,0.15)"
EQUATOR_COL = "rgba(26,26,23,0.30)"
BOUNDARY_COL = "rgba(74,74,68,0.55)"
BG_STAR_COL = "rgba(107,106,99,0.45)"
MW_COL = "rgba(107,106,99,0.06)"
else:
PAGE_BG = "#1A1A17"
ELEVATED_BG = "#242420"
INK = "#F0EFE8"
INK_SOFT = "#B8B7B0"
INK_MUTED = "#A8A79F"
LINE_COL = "rgba(184,183,176,0.55)"
GRID_COL = "rgba(240,239,232,0.16)"
EQUATOR_COL = "rgba(240,239,232,0.32)"
BOUNDARY_COL = "rgba(184,183,176,0.55)"
BG_STAR_COL = "rgba(184,183,176,0.50)"
MW_COL = "rgba(168,167,159,0.10)"
# Continuous Imprint colormap (sequential): brand green -> blue. Maps bright
# (low magnitude) stars to #009E73 and faint stars toward #4467A3.
IMPRINT_SEQ = [[0.0, "#009E73"], [1.0, "#4467A3"]]
# Amber semantic anchor for the ecliptic reference line (constant across themes).
ECLIPTIC_COL = "rgba(221,204,119,0.60)"
# Azimuthal-equidistant projection centred on the North Celestial Pole.
# Co-declination is the true radial distance (deg); RA is the azimuth.
def project(ra_hours, dec_deg):
ra_rad = np.radians(np.asarray(ra_hours, dtype=float) * 15.0)
r = 90.0 - np.asarray(dec_deg, dtype=float)
return r * np.sin(ra_rad), r * np.cos(ra_rad)
# Galactic (l, b) -> equatorial (RA hours, Dec deg), J2000 pole constants.
def gal_to_eq(l_deg, b_deg):
lon = np.radians(l_deg)
b = np.radians(b_deg)
a_ngp = np.radians(192.85948)
d_ngp = np.radians(27.12825)
l_ncp = np.radians(122.93192)
sin_d = np.sin(d_ngp) * np.sin(b) + np.cos(d_ngp) * np.cos(b) * np.cos(l_ncp - lon)
dec = np.arcsin(sin_d)
yy = np.cos(b) * np.sin(l_ncp - lon)
xx = np.cos(d_ngp) * np.sin(b) - np.sin(d_ngp) * np.cos(b) * np.cos(l_ncp - lon)
ra = (a_ngp + np.arctan2(yy, xx)) % (2 * np.pi)
return np.degrees(ra) / 15.0, np.degrees(dec)
# Data - Notable stars with RA (hours), Dec (degrees), magnitude, constellation
np.random.seed(42)
stars = {
# Orion
"Betelgeuse": (5.92, 7.41, 0.42, "Ori"),
"Rigel": (5.24, -8.20, 0.13, "Ori"),
"Bellatrix": (5.42, 6.35, 1.64, "Ori"),
"Mintaka": (5.53, -0.30, 2.23, "Ori"),
"Alnilam": (5.60, -1.20, 1.69, "Ori"),
"Alnitak": (5.68, -1.94, 1.77, "Ori"),
"Saiph": (5.80, -9.67, 2.09, "Ori"),
# Ursa Major
"Dubhe": (11.06, 61.75, 1.79, "UMa"),
"Merak": (11.03, 56.38, 2.37, "UMa"),
"Phecda": (11.90, 53.69, 2.44, "UMa"),
"Megrez": (12.26, 57.03, 3.31, "UMa"),
"Alioth": (12.90, 55.96, 1.77, "UMa"),
"Mizar": (13.40, 54.93, 2.27, "UMa"),
"Alkaid": (13.79, 49.31, 1.86, "UMa"),
# Cassiopeia
"Schedar": (0.68, 56.54, 2.23, "Cas"),
"Caph": (0.15, 59.15, 2.27, "Cas"),
"Gamma Cas": (0.95, 60.72, 2.47, "Cas"),
"Ruchbah": (1.36, 60.24, 2.68, "Cas"),
"Segin": (1.91, 63.67, 3.37, "Cas"),
# Leo
"Regulus": (10.14, 11.97, 1.35, "Leo"),
"Denebola": (11.82, 14.57, 2.13, "Leo"),
"Algieba": (10.33, 19.84, 2.08, "Leo"),
"Zosma": (11.24, 20.52, 2.56, "Leo"),
"Chertan": (11.24, 15.43, 3.33, "Leo"),
# Scorpius
"Antares": (16.49, -26.43, 1.09, "Sco"),
"Shaula": (17.56, -37.10, 1.63, "Sco"),
"Sargas": (17.62, -42.99, 1.87, "Sco"),
"Dschubba": (16.01, -22.62, 2.32, "Sco"),
"Graffias": (16.09, -19.81, 2.64, "Sco"),
"Epsilon Sco": (16.84, -34.29, 2.29, "Sco"),
"Kappa Sco": (17.71, -39.03, 2.41, "Sco"),
# Cygnus
"Deneb": (20.69, 45.28, 1.25, "Cyg"),
"Sadr": (20.37, 40.26, 2.20, "Cyg"),
"Gienah Cyg": (20.77, 33.97, 2.46, "Cyg"),
"Delta Cyg": (19.75, 45.13, 2.87, "Cyg"),
"Albireo": (19.51, 27.96, 3.08, "Cyg"),
# Lyra
"Vega": (18.62, 38.78, 0.03, "Lyr"),
"Sheliak": (18.83, 33.36, 3.45, "Lyr"),
"Sulafat": (18.98, 32.69, 3.24, "Lyr"),
"Delta1 Lyr": (18.91, 36.90, 4.22, "Lyr"),
# Gemini
"Castor": (7.58, 31.89, 1.58, "Gem"),
"Pollux": (7.76, 28.03, 1.14, "Gem"),
"Alhena": (6.63, 16.40, 1.93, "Gem"),
"Tejat": (6.38, 22.51, 2.88, "Gem"),
"Mebsuta": (6.73, 25.13, 3.06, "Gem"),
# Taurus
"Aldebaran": (4.60, 16.51, 0.85, "Tau"),
"Elnath": (5.44, 28.61, 1.65, "Tau"),
"Alcyone": (3.79, 24.11, 2.87, "Tau"),
"Zeta Tau": (5.63, 21.14, 3.03, "Tau"),
"Tau Epsilon": (4.48, 19.18, 3.53, "Tau"),
# Canis Major
"Sirius": (6.75, -16.72, -1.46, "CMa"),
"Adhara": (6.98, -28.97, 1.50, "CMa"),
"Wezen": (7.14, -26.39, 1.84, "CMa"),
"Mirzam": (6.38, -17.96, 1.98, "CMa"),
"Aludra": (7.40, -29.30, 2.45, "CMa"),
# Aquila
"Altair": (19.85, 8.87, 0.77, "Aql"),
"Tarazed": (19.77, 10.61, 2.72, "Aql"),
"Alshain": (19.92, 6.41, 3.71, "Aql"),
# Boötes
"Arcturus": (14.26, 19.18, -0.05, "Boo"),
"Izar": (14.75, 27.07, 2.37, "Boo"),
"Muphrid": (13.91, 18.40, 2.68, "Boo"),
"Eta Boo": (13.85, 18.40, 2.68, "Boo"),
# Auriga
"Capella": (5.28, 46.00, 0.08, "Aur"),
"Menkalinan": (5.99, 44.95, 1.90, "Aur"),
"Theta Aur": (5.99, 37.21, 2.62, "Aur"),
"Iota Aur": (4.95, 33.17, 2.69, "Aur"),
# Perseus
"Mirfak": (3.41, 49.86, 1.80, "Per"),
"Algol": (3.14, 40.96, 2.12, "Per"),
"Zeta Per": (3.90, 31.88, 2.85, "Per"),
"Epsilon Per": (3.96, 40.01, 2.89, "Per"),
# Virgo
"Spica": (13.42, -11.16, 1.04, "Vir"),
"Vindemiatrix": (13.04, 10.96, 2.83, "Vir"),
"Porrima": (12.69, -1.45, 2.74, "Vir"),
# Sagittarius
"Kaus Australis": (18.40, -34.38, 1.85, "Sgr"),
"Nunki": (18.92, -26.30, 2.02, "Sgr"),
"Ascella": (19.04, -29.88, 2.59, "Sgr"),
"Kaus Media": (18.35, -29.83, 2.70, "Sgr"),
"Kaus Borealis": (18.47, -25.42, 2.81, "Sgr"),
# Pegasus
"Enif": (21.74, 9.88, 2.39, "Peg"),
"Scheat": (23.06, 28.08, 2.42, "Peg"),
"Markab": (23.08, 15.21, 2.49, "Peg"),
"Algenib": (0.22, 15.18, 2.83, "Peg"),
# Andromeda
"Alpheratz": (0.14, 29.09, 2.06, "And"),
"Mirach": (1.16, 35.62, 2.05, "And"),
"Almach": (2.07, 42.33, 2.17, "And"),
# Corona Borealis
"Alphecca": (15.58, 26.71, 2.23, "CrB"),
# Libra
"Zubeneschamali": (15.28, -9.38, 2.61, "Lib"),
"Zubenelgenubi": (14.85, -16.04, 2.75, "Lib"),
# Aries
"Hamal": (2.12, 23.46, 2.00, "Ari"),
"Sheratan": (1.91, 20.81, 2.64, "Ari"),
# Draco
"Eltanin": (17.94, 51.49, 2.23, "Dra"),
"Rastaban": (17.51, 52.30, 2.79, "Dra"),
"Thuban": (14.07, 64.38, 3.65, "Dra"),
"Eta Dra": (16.40, 61.51, 2.74, "Dra"),
# Canis Minor
"Procyon": (7.66, 5.22, 0.34, "CMi"),
"Gomeisa": (7.45, 8.29, 2.90, "CMi"),
# Pisces Austrinus
"Fomalhaut": (22.96, -29.62, 1.16, "PsA"),
# Centaurus
"Rigil Kentaurus": (14.66, -60.83, -0.01, "Cen"),
"Hadar": (14.06, -60.37, 0.61, "Cen"),
# Crux
"Acrux": (12.44, -63.10, 0.76, "Cru"),
"Mimosa": (12.80, -59.69, 1.25, "Cru"),
"Gacrux": (12.52, -57.11, 1.64, "Cru"),
"Delta Cru": (12.25, -58.75, 2.80, "Cru"),
}
# Constellation line connections (pairs of star names)
edges = [
# Orion
("Betelgeuse", "Bellatrix"),
("Bellatrix", "Mintaka"),
("Mintaka", "Alnilam"),
("Alnilam", "Alnitak"),
("Alnitak", "Saiph"),
("Saiph", "Rigel"),
("Rigel", "Mintaka"),
("Betelgeuse", "Alnitak"),
# Ursa Major (Big Dipper)
("Dubhe", "Merak"),
("Merak", "Phecda"),
("Phecda", "Megrez"),
("Megrez", "Alioth"),
("Alioth", "Mizar"),
("Mizar", "Alkaid"),
("Megrez", "Dubhe"),
# Cassiopeia
("Caph", "Schedar"),
("Schedar", "Gamma Cas"),
("Gamma Cas", "Ruchbah"),
("Ruchbah", "Segin"),
# Leo
("Regulus", "Chertan"),
("Chertan", "Denebola"),
("Denebola", "Zosma"),
("Zosma", "Algieba"),
("Algieba", "Regulus"),
# Scorpius
("Graffias", "Dschubba"),
("Dschubba", "Antares"),
("Antares", "Epsilon Sco"),
("Epsilon Sco", "Shaula"),
("Shaula", "Kappa Sco"),
("Kappa Sco", "Sargas"),
# Cygnus
("Deneb", "Sadr"),
("Sadr", "Gienah Cyg"),
("Sadr", "Delta Cyg"),
("Sadr", "Albireo"),
# Lyra
("Vega", "Sheliak"),
("Vega", "Sulafat"),
("Sheliak", "Sulafat"),
# Gemini
("Castor", "Pollux"),
("Pollux", "Mebsuta"),
("Mebsuta", "Tejat"),
("Castor", "Mebsuta"),
("Pollux", "Alhena"),
# Taurus
("Aldebaran", "Tau Epsilon"),
("Tau Epsilon", "Alcyone"),
("Aldebaran", "Zeta Tau"),
("Zeta Tau", "Elnath"),
# Canis Major
("Sirius", "Mirzam"),
("Sirius", "Adhara"),
("Adhara", "Wezen"),
("Wezen", "Aludra"),
# Aquila
("Altair", "Tarazed"),
("Altair", "Alshain"),
# Boötes
("Arcturus", "Izar"),
("Arcturus", "Muphrid"),
# Auriga
("Capella", "Menkalinan"),
("Menkalinan", "Theta Aur"),
("Theta Aur", "Iota Aur"),
("Iota Aur", "Capella"),
# Perseus
("Mirfak", "Algol"),
("Mirfak", "Epsilon Per"),
("Epsilon Per", "Zeta Per"),
# Andromeda
("Alpheratz", "Mirach"),
("Mirach", "Almach"),
# Pegasus (Great Square)
("Alpheratz", "Scheat"),
("Scheat", "Markab"),
("Markab", "Algenib"),
("Algenib", "Alpheratz"),
# Sagittarius (Teapot)
("Kaus Australis", "Kaus Media"),
("Kaus Media", "Kaus Borealis"),
("Kaus Borealis", "Nunki"),
("Nunki", "Ascella"),
("Ascella", "Kaus Australis"),
# Aries
("Hamal", "Sheratan"),
# Draco
("Eltanin", "Rastaban"),
("Rastaban", "Eta Dra"),
("Eta Dra", "Thuban"),
# Canis Minor
("Procyon", "Gomeisa"),
# Centaurus
("Rigil Kentaurus", "Hadar"),
# Crux
("Acrux", "Gacrux"),
("Mimosa", "Delta Cru"),
# Libra
("Zubeneschamali", "Zubenelgenubi"),
]
# Constellation full names for labels
constellation_names = {
"Ori": "Orion",
"UMa": "Ursa Major",
"Cas": "Cassiopeia",
"Leo": "Leo",
"Sco": "Scorpius",
"Cyg": "Cygnus",
"Lyr": "Lyra",
"Gem": "Gemini",
"Tau": "Taurus",
"CMa": "Canis Major",
"Aql": "Aquila",
"Boo": "Boötes",
"Aur": "Auriga",
"Per": "Perseus",
"Vir": "Virgo",
"Sgr": "Sagittarius",
"Peg": "Pegasus",
"And": "Andromeda",
"CrB": "Corona Borealis",
"Lib": "Libra",
"Ari": "Aries",
"Dra": "Draco",
"CMi": "Canis Minor",
"PsA": "Piscis Austrinus",
"Cen": "Centaurus",
"Cru": "Crux",
}
# Geometry of the planisphere (radius = co-declination, degrees)
R_BOUNDARY = 156.0 # outer frame, just beyond the southernmost catalogued stars
DEC_RINGS = [60, 30, 0, -30, -60] # labelled declination circles
# Project the named stars
star_names = list(stars.keys())
ra_h = np.array([stars[s][0] for s in star_names])
dec = np.array([stars[s][1] for s in star_names])
mag = np.array([stars[s][2] for s in star_names])
star_x, star_y = project(ra_h, dec)
# Magnitude -> marker size (brighter / lower magnitude = larger)
max_size, min_size = 15.0, 2.5
mag_min, mag_max = mag.min(), mag.max()
sizes = max_size - (mag - mag_min) / (mag_max - mag_min) * (max_size - min_size)
# Dimmer background star field, projected within the visible cap
bg_ra = np.random.uniform(0, 24, 220)
bg_dec = np.random.uniform(-58, 87, 220)
bg_x, bg_y = project(bg_ra, bg_dec)
fig = go.Figure()
# Milky Way band - faint filled great-circle ribbon (galactic latitude +/-12 deg)
gl = np.linspace(0, 360, 361)
mw_ra_top, mw_dec_top = gal_to_eq(gl, 12.0)
mw_ra_bot, mw_dec_bot = gal_to_eq(gl[::-1], -12.0)
mw_xt, mw_yt = project(mw_ra_top, mw_dec_top)
mw_xb, mw_yb = project(mw_ra_bot, mw_dec_bot)
fig.add_trace(
go.Scatter(
x=np.concatenate([mw_xt, mw_xb]),
y=np.concatenate([mw_yt, mw_yb]),
mode="lines",
fill="toself",
fillcolor=MW_COL,
line={"width": 0},
hoverinfo="skip",
showlegend=False,
)
)
# Coordinate grid - declination rings + right-ascension spokes
ring_x, ring_y = [], []
for dec_ring in DEC_RINGS:
if dec_ring == 0:
continue # equator drawn separately, emphasised
rr = 90.0 - dec_ring
th = np.linspace(0, 2 * np.pi, 240)
ring_x.extend((rr * np.cos(th)).tolist() + [None])
ring_y.extend((rr * np.sin(th)).tolist() + [None])
spoke_x, spoke_y = [], []
for h in range(0, 24, 2):
a = np.radians(h * 15)
spoke_x.extend([0.0, 150.0 * np.sin(a), None])
spoke_y.extend([0.0, 150.0 * np.cos(a), None])
fig.add_trace(
go.Scatter(
x=ring_x + spoke_x,
y=ring_y + spoke_y,
mode="lines",
line={"color": GRID_COL, "width": 0.7},
hoverinfo="skip",
showlegend=False,
)
)
# Celestial equator (dec = 0) - emphasised reference circle
th = np.linspace(0, 2 * np.pi, 300)
fig.add_trace(
go.Scatter(
x=90.0 * np.cos(th),
y=90.0 * np.sin(th),
mode="lines",
line={"color": EQUATOR_COL, "width": 1.0},
hoverinfo="skip",
showlegend=False,
)
)
# Outer sky boundary
fig.add_trace(
go.Scatter(
x=R_BOUNDARY * np.cos(th),
y=R_BOUNDARY * np.sin(th),
mode="lines",
line={"color": BOUNDARY_COL, "width": 1.2},
hoverinfo="skip",
showlegend=False,
)
)
# Ecliptic - amber dashed great circle (23.44 deg inclined to the equator)
ecl_lon = np.linspace(0, 360, 361)
obliquity = np.radians(23.44)
ecl_ra = np.degrees(np.arctan2(np.sin(np.radians(ecl_lon)) * np.cos(obliquity), np.cos(np.radians(ecl_lon)))) / 15.0
ecl_dec = np.degrees(np.arcsin(np.sin(np.radians(ecl_lon)) * np.sin(obliquity)))
ecl_x, ecl_y = project(ecl_ra % 24, ecl_dec)
fig.add_trace(
go.Scatter(
x=ecl_x,
y=ecl_y,
mode="lines",
line={"color": ECLIPTIC_COL, "width": 1.4, "dash": "dash"},
name="Ecliptic",
hoverinfo="skip",
showlegend=False,
)
)
# Constellation stick-figure lines (projected, single trace with separators)
line_x, line_y = [], []
for s1, s2 in edges:
if s1 in stars and s2 in stars:
x1, y1 = project(stars[s1][0], stars[s1][1])
x2, y2 = project(stars[s2][0], stars[s2][1])
line_x.extend([float(x1), float(x2), None])
line_y.extend([float(y1), float(y2), None])
fig.add_trace(
go.Scatter(
x=line_x, y=line_y, mode="lines", line={"color": LINE_COL, "width": 1.2}, hoverinfo="skip", showlegend=False
)
)
# Background stars (WebGL for the dense field)
fig.add_trace(
go.Scattergl(
x=bg_x, y=bg_y, mode="markers", marker={"size": 1.6, "color": BG_STAR_COL}, hoverinfo="skip", showlegend=False
)
)
# Named stars - size + Imprint-sequential colour both encode magnitude
fig.add_trace(
go.Scattergl(
x=star_x,
y=star_y,
mode="markers",
marker={
"size": sizes,
"color": mag,
"colorscale": IMPRINT_SEQ,
"cmin": -1.5,
"cmax": 3.8,
"opacity": 0.95,
"line": {"width": 0},
"colorbar": {
"title": {"text": "Apparent magnitude", "font": {"size": 11, "color": INK}, "side": "top"},
"orientation": "h",
"x": 0.5,
"xanchor": "center",
"y": -0.06,
"yanchor": "top",
"len": 0.46,
"thickness": 14,
"tickfont": {"size": 9, "color": INK_SOFT},
"tickvals": [-1, 0, 1, 2, 3],
"outlinewidth": 0,
},
},
text=[
f"{name}<br>Mag {stars[name][2]:.2f}<br>{constellation_names.get(stars[name][3], stars[name][3])}"
for name in star_names
],
hoverinfo="text",
showlegend=False,
)
)
# Annotations: constellation labels, grid labels, brightest-star labels
ann = []
# Constellation names at each group's projected centroid, nudged radially out
groups = defaultdict(list)
for i, name in enumerate(star_names):
groups[stars[name][3]].append((star_x[i], star_y[i]))
centroids = {}
for abbr, pts in groups.items():
centroids[abbr] = (float(np.mean([p[0] for p in pts])), float(np.mean([p[1] for p in pts])))
if len(pts) < 2:
continue # skip single-star constellations to avoid clutter
cx, cy = centroids[abbr]
rad = np.hypot(cx, cy) or 1.0
ann.append(
{
"x": cx + cx / rad * 9.0,
"y": cy + cy / rad * 9.0,
"text": constellation_names.get(abbr, abbr),
"showarrow": False,
"font": {"size": 10, "color": INK_SOFT, "family": "Arial"},
}
)
# Brightest stars (mag < 0.2) get individual labels, pushed away from the
# constellation-name centroid so the two labels never collide.
for i, name in enumerate(star_names):
if mag[i] < 0.2:
cx, cy = centroids[stars[name][3]]
dx, dy = star_x[i] - cx, star_y[i] - cy
d = np.hypot(dx, dy)
if d < 1.0: # star sits on the centroid -> push radially outward instead
dx, dy = star_x[i], star_y[i]
d = np.hypot(dx, dy) or 1.0
ann.append(
{
"x": float(star_x[i] + dx / d * 9.0),
"y": float(star_y[i] + dy / d * 9.0),
"text": name,
"showarrow": False,
"font": {"size": 9, "color": INK, "family": "Arial"},
}
)
# Declination ring labels (placed along a clear gap between spokes)
for dec_ring in DEC_RINGS:
rr = 90.0 - dec_ring
a = np.radians(7)
dec_label = f"{dec_ring:+d}°" if dec_ring != 0 else "0°"
ann.append(
{
"x": float(rr * np.sin(a)),
"y": float(rr * np.cos(a)),
"text": dec_label,
"showarrow": False,
"font": {"size": 9, "color": INK_MUTED, "family": "Arial"},
}
)
# Right-ascension labels around the outer rim
for h in range(0, 24, 2):
a = np.radians(h * 15)
ann.append(
{
"x": float((R_BOUNDARY + 6) * np.sin(a)),
"y": float((R_BOUNDARY + 6) * np.cos(a)),
"text": f"{h}h",
"showarrow": False,
"font": {"size": 9, "color": INK_SOFT, "family": "Arial"},
}
)
# North Celestial Pole marker at the centre
ann.append(
{"x": 0, "y": -7, "text": "NCP", "showarrow": False, "font": {"size": 8.5, "color": INK_MUTED, "family": "Arial"}}
)
axis_off = {"visible": False, "showgrid": False, "zeroline": False, "range": [-(R_BOUNDARY + 14), R_BOUNDARY + 14]}
fig.update_layout(
title={
"text": "star-chart-constellation · python · plotly · anyplot.ai",
"font": {"size": 16, "color": INK, "family": "Arial"},
"x": 0.5,
"xanchor": "center",
"y": 0.97,
},
autosize=False,
paper_bgcolor=PAGE_BG,
plot_bgcolor=PAGE_BG,
font={"color": INK},
xaxis={**axis_off, "scaleanchor": "y", "scaleratio": 1},
yaxis=dict(axis_off),
margin={"l": 40, "r": 40, "t": 70, "b": 90},
annotations=ann,
)
# Save - square 2400 x 2400 (600 x 600 @ scale 4)
fig.write_image(f"plot-{THEME}.png", width=600, height=600, scale=4)
fig.write_html(f"plot-{THEME}.html", include_plotlyjs="cdn")
Part of Star Chart with Constellations on anyplot.ai.