187 lines
5.5 KiB
JSON
187 lines
5.5 KiB
JSON
{
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"id": "time-scale-conversion",
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"title": "Time scale conversion",
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"summary": "How an instant enters the model, is stored on one uniform scale, and is read back on any supported scale.",
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"nodes": [
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{
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"id": "input",
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"label": "Calendar fields or an MJD, with a scale",
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"kind": "data",
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"group": "input",
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"summary": "The caller states which scale the number is on. A calendar date is also accepted.",
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"label_zh": "日历字段或 MJD，附尺度",
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"summary_zh": "调用方说明该数值所在尺度。也接受日历日期。"
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},
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{
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"id": "valid",
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"label": "Fields a valid date?",
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"kind": "decision",
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"group": "validate",
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"summary": "The month and day must exist in that year, including the leap year rule.",
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"label_zh": "字段是有效日期？",
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"summary_zh": "月与日必须在该年中存在，包括闰年规则。"
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},
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{
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"id": "invalid",
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"label": "Rejected",
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"kind": "terminal",
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"group": "error",
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"summary": "The fields do not form a valid calendar date, or the request is outside the leap second table.",
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"label_zh": "已拒绝",
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"summary_zh": "字段不构成有效日历日期，或请求超出闰秒表范围。"
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},
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{
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"id": "to_mjd",
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"label": "Convert to a day number",
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"kind": "step",
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"group": "convert",
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"summary": "A calendar date becomes a Modified Julian Date on the stated scale.",
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"api": "mjd_from_ymd",
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"label_zh": "转换为日编号",
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"summary_zh": "日历日期变为指定尺度上的约化儒略日。"
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},
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{
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"id": "scale",
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"label": "Which scale?",
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"kind": "decision",
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"group": "convert",
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"summary": "TAI, TT, and GPS convert by a constant offset; UTC converts through the leap second table.",
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"label_zh": "哪个尺度？",
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"summary_zh": "TAI、TT 与 GPS 按常数偏移转换；UTC 通过闰秒表转换。"
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},
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{
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"id": "constant",
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"label": "Apply the constant offset",
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"kind": "step",
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"group": "convert",
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"summary": "TT minus TAI is 32.184 seconds and TAI minus GPS is 19 seconds.",
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"api": "Epoch",
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"label_zh": "施加常数偏移",
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"summary_zh": "TT 减 TAI 为 32.184 秒，TAI 减 GPS 为 19 秒。"
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},
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{
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"id": "leap",
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"label": "Look up the leap second offset",
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"kind": "step",
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"group": "convert",
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"summary": "Search the embedded table for the interval that contains the instant.",
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"api": "Epoch",
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"label_zh": "查找闰秒偏移",
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"summary_zh": "在内嵌表中查找包含该时刻的区间。"
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},
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{
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"id": "covered",
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"label": "Covered by the table?",
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"kind": "decision",
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"group": "convert",
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"summary": "The table starts at the beginning of 1972.",
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"label_zh": "表覆盖该时刻？",
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"summary_zh": "表起始于 1972 年初。"
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},
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{
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"id": "tai",
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"label": "Epoch on the TAI scale",
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"kind": "data",
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"group": "store",
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"summary": "The instant is stored as a Modified Julian Date on TAI, so the difference between two instants is exact elapsed time.",
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"label_zh": "TAI 尺度上的 Epoch",
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"summary_zh": "时刻以 TAI 上的约化儒略日存储，因此两个时刻之差恰为经过时间。"
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},
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{
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"id": "read",
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"label": "Read back on the requested scale",
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"kind": "step",
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"group": "convert",
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"summary": "The inverse of the entry conversion, producing an MJD and a calendar value.",
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"api": "Epoch",
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"label_zh": "按要求尺度读回",
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"summary_zh": "入口转换的逆变换，产生 MJD 与日历值。"
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},
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{
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"id": "output",
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"label": "MJD and calendar on every scale",
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"kind": "terminal",
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"group": "output",
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"summary": "The result reports UTC, TAI, TT, and GPS together with the offset at that instant.",
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"label_zh": "各尺度上的 MJD 与日历",
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"summary_zh": "结果同时报告 UTC、TAI、TT 与 GPS，以及该时刻的偏移。"
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}
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],
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"edges": [
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{
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"source": "input",
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"target": "valid",
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"kind": "flow",
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"label": null
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},
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{
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"source": "valid",
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"target": "invalid",
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"kind": "branch",
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"label": "no"
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},
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{
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"source": "valid",
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"target": "to_mjd",
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"kind": "branch",
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"label": "yes"
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},
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{
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"source": "to_mjd",
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"target": "scale",
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"kind": "flow",
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"label": null
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},
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{
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"source": "scale",
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"target": "constant",
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"kind": "branch",
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"label": "TAI, TT, or GPS"
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},
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{
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"source": "scale",
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"target": "leap",
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"kind": "branch",
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"label": "UTC"
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},
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{
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"source": "leap",
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"target": "covered",
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"kind": "flow",
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"label": null
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},
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{
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"source": "covered",
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"target": "invalid",
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"kind": "branch",
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"label": "no"
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},
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{
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"source": "covered",
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"target": "tai",
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"kind": "branch",
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"label": "yes"
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},
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{
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"source": "constant",
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"target": "tai",
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"kind": "flow",
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"label": null
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},
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{
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"source": "tai",
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"target": "read",
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"kind": "flow",
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"label": null
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},
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{
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"source": "read",
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"target": "output",
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"kind": "flow",
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"label": null
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}
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],
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"title_zh": "时间尺度转换",
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"summary_zh": "时刻如何进入模型、以单一均匀尺度存储，并以任意支持的尺度读回。"
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}
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