ST-OBS-001 · Astronomical
Daylight arc
annual cycleglobal with latitude variation
fact-supported
Observe: day length, solar elevation, direction and duration of direct light
Process: Earth’s axial tilt changes the seasonal distribution of sunlight by latitude and hemisphere.
Represent: long/short shadow systems, warm/cool light as editorial metaphor only, arc diagrams
Boundary: Do not infer local temperature or cultural season names from daylight geometry alone.
ST-SRC-001 · ST-SRC-008
ST-OBS-002 · Meteorological
Meteorological quarter
three-month groupingsconvention-dependent
fact-supported
Observe: calendar-month grouping, climate summaries across fixed windows
Process: Meteorological seasons group complete months for consistent climate comparison.
Represent: quarter grids, calendar bands, summary dashboards
Boundary: NOAA’s familiar winter/spring/summer/fall labels are Northern-Hemisphere conventions; use month ranges when working globally.
ST-SRC-002
ST-OBS-003 · Phenological
Leaf-out pulse
variable by species/place/yearplace-specific
fact-supported
Observe: bud break, unfolding leaves, canopy change
Process: Phenological stages respond to environmental cues and vary across organisms, places, and years.
Represent: emergence sequences, density increase, fresh-leaf texture studies
Boundary: A visual “spring” cue is not a universal date; observation should name location, organism, and timing.
ST-SRC-003
ST-OBS-004 · Phenological
Flowering interval
species-specificplace-specific
fact-supported
Observe: open flowers, flower abundance, sequence across species
Process: Flowering is a recurring phenophase whose timing can shift with environmental conditions.
Represent: burst patterns, accent-color rhythm, sequence notation
Boundary: Do not treat bloom timing or a single flower species as a global seasonal clock.
ST-SRC-003
ST-OBS-005 · Phenological
High-canopy density
growing-season statevegetation-dependent
editorial-synthesis
Observe: dense foliage, layered shade, high leaf area
Process: This is an authored observation lens for mature foliage, not a universal scientific phase.
Represent: deep layered greens, broken light, high texture density
Boundary: Treat “summer lushness” as a regional design shorthand, not a factual universal state.
ST-SRC-003
ST-OBS-006 · Atmospheric
Wet-season surface
rainfall regimemany tropical/subtropical regions
fact-supported
Observe: repeated rainfall, saturated surfaces, cloud/rain rhythm
Process: Seasonal migration of large-scale convergence zones contributes to wet/dry-season rainfall patterns in many tropical regions.
Represent: specular surfaces, rain-density marks, humidity/soft-edge studies
Boundary: Wet-season timing and intensity vary by region; do not transplant one monsoon calendar everywhere.
ST-SRC-005
ST-OBS-007 · Atmospheric
Dry-season contrast
rainfall regimemany tropical/subtropical regions
editorial-synthesis
Observe: reduced rainfall, drying surfaces, vegetation response where applicable
Process: This record is paired with wet-season rainfall seasonality; local ecology determines the visible response.
Represent: matte texture, dust/seed/grass studies, high value contrast
Boundary: “Dry season” does not automatically mean brown vegetation or drought; observe the actual place.
ST-SRC-005
ST-OBS-008 · Phenological
Deciduous color change
senescence intervaldeciduous vegetation where present
fact-supported
Observe: green decline, yellow/orange/red/brown transitions, leaf fall progression
Process: As chlorophyll declines, other pigments can become visible; some red coloration involves anthocyanins and local conditions.
Represent: gradient sequences, mixed-stage mosaics, falling-density rhythm
Boundary: Species and conditions differ. “Autumn = red leaves” is a narrow regional shorthand, not a universal seasonal palette.
ST-SRC-004
ST-OBS-009 · Observational
Frost edge
event-basedfreeze-prone places
editorial-synthesis
Observe: ice crystals, whitened margins, brief morning persistence
Process: This is an observation motif. This candidate does not provide freeze forecasting or climatological thresholds.
Represent: edge highlights, granular sparkle, temporary overlays
Boundary: Label as an observed or designed frost cue; do not imply a forecast, date, or climate norm.
No external factual claim attached
ST-OBS-010 · Observational
Snow / ice field
weather-dependentsnow/ice-capable places
editorial-synthesis
Observe: snow cover, ice surfaces, reduced visible ground texture
Process: A visual observation category rather than a universal winter condition.
Represent: low-chroma fields, blue-gray shadow study, negative-space emphasis
Boundary: Winter can exist without snow, and snow/ice can occur outside a simple four-season calendar.
No external factual claim attached
ST-OBS-011 · Cultural / editorial
Harvest / abundance motif
culture/crop dependentcontext-specific
editorial-synthesis
Observe: harvested materials, stored produce, festival/market arrangements
Process: Seasonal labor and celebration can become visual motifs, but the specific timing and meaning depend on place and culture.
Represent: bundling, repetition, container/display rhythms
Boundary: Never universalize one crop, holiday, or harvest image as “the” season.
No external factual claim attached
ST-OBS-012 · Cultural / editorial
Seasonal allegory
art-historical conventionculture/work-specific
fact-supported + interpretation
Observe: personification, seasonal plants/landscapes, cyclical sequences
Process: Artists and designers have used season cycles as organizing structures, with distinct conventions across cultures and periods.
Represent: four-part cycles, scroll/screen progression, allegorical figures, month-by-month sequences
Boundary: The “four seasons” format is one representation tradition, not the only legitimate seasonal structure.
ST-SRC-006 · ST-SRC-007