Open Ephemeris vs MCP Server Chart
A side-by-side look at the Open Ephemeris and MCP Server Chart MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Open Ephemeris for aerospace & astrodynamics work as a local process; choose MCP Server Chart for data visualization as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Open Ephemeris when
- You need dedicated capabilities in the Aerospace & Astrodynamics domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
OPENEPHEMERIS_PROFILE, OPENEPHEMERIS_BACKEND_URL, OPENEPHEMERIS_API_KEY. - You want tools like
explore_natal_chart, explore_human_design, explore_human_design_transit.
Choose MCP Server Chart when
- You need dedicated capabilities in the Data Visualization domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
generate_area_chart, generate_bar_chart, generate_boxplot_chart.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Aerospace & Astrodynamics | Data Visualization |
| Quality signal | 64/100 · Good | 71/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | OPENEPHEMERIS_PROFILEOPENEPHEMERIS_BACKEND_URLOPENEPHEMERIS_API_KEY | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 5 | 4,402 |
| Directory activity | 2 views 0 installs 0 upvotes | 10 views 0 installs 0 upvotes |
| Tools | 39 | 27 |
| Full listing | View Open Ephemeris | View MCP Server Chart |
Tools & capabilities
Open Ephemeris tools 39
explore_natal_chartUse this when the user asks 'show me my birth chart', 'what's my rising sign', 'my big 3', 'what's my sun, moon and rising', 'what sign is my Moon / Venus / Mars in', 'what does my chart say about my career / love', 'read my chart', or shares birth details and wants to explore them — any natal / birth-chart / astrology-chart request. Returns an interactive chart wheel rendered inline (Claude and ChatGPT; text summary elsewhere) where any planet, house or aspect line can be clicked for interpretation, with switchable house systems. The birthplace can be given as `location` (a place name — resolved server-side) or as coordinates, together with the birth date and local time and its zone. CREDIT COST: 1 credit per call (+1 to resolve a place name).explore_human_designUse this when the user asks 'what's my Human Design', 'am I a Generator / Projector / Manifestor / Reflector', 'show my bodygraph', 'what's my HD type and profile', 'what's my strategy and authority' or 'what's my incarnation cross'. Returns an interactive bodygraph (inline in Claude and ChatGPT; text summary elsewhere) showing defined/undefined centers, active gates, channels, Type, Profile, Authority and Incarnation Cross, with any center or gate clickable for interpretation. Birthplace may be a place name (`location`). CREDIT COST: 4 credits per call (2 chart + 2 render; +1 to resolve a place name). Human Design was originated by Ra Uru Hu; OpenEphemeris is an independent calculation service, not affiliated with Jovian Archive.explore_human_design_transitUse this when the user asks 'what are today's Human Design transits for me', 'what gates are being activated for me right now', 'which channels does this transit complete in my chart' or 'how is the current sky affecting my bodygraph'. Returns an interactive overlay bodygraph (inline in Claude and ChatGPT; text summary elsewhere) highlighting the channels the transit temporarily COMPLETES with the natal chart and any centers it newly defines, for now or a chosen datetime. Birthplace may be a place name (`location`). CREDIT COST: 5 credits per call (chart 3 + render 2; +1 per place name). Human Design was originated by Ra Uru Hu; OpenEphemeris is an independent calculation service, not affiliated with Jovian Archive.explore_human_design_connectionUse this when the user asks 'are we compatible in Human Design', 'what's our connection chart', 'what channels do we make together' or 'show our composite bodygraph' — two people's HD charts overlaid. Returns an interactive two-person overlay bodygraph (inline in Claude and ChatGPT; text summary elsewhere) with every connected channel classified by HD connection theory: electromagnetic (attraction), companionship (sameness), dominance (one defines), compromise (friction). CREDIT COST: 5 credits per call (composite 3 + render 2). Human Design was originated by Ra Uru Hu; OpenEphemeris is an independent calculation service, not affiliated with Jovian Archive.explore_bi_wheelUse this when the user asks 'are we compatible', 'compare my chart with my partner's', 'what's my horoscope for today', 'what's hitting my chart right now', 'what's my solar return chart this year' or 'my progressed chart on my birth chart' — any two-ring comparison they should SEE. Returns an interactive bi-wheel (inline in Claude and ChatGPT; text summary elsewhere): inner wheel Person 1's natal chart, outer ring by mode — synastry (Person 2's natal; needs their birthplace), transit (a date; today for a daily horoscope), progressed, solar_arc (target date), solar_return (target year), lunar_return (target month) — with cross-aspects drawn and every planet, aspect line and cusp clickable. Birthplaces may be place names (`location`, `person2_location`). CREDIT COST: 2 credits per call for most modes (1 per wheel; +1 to resolve a place name); solar_return/lunar_return modes cost 6.explore_moon_phaseUse this when the user asks 'what's the moon phase tonight', 'is tonight a full moon', 'show me the moon right now', 'what sign is the Moon in', 'is the Moon void of course' — or has no birth data and wants somewhere to start; it needs no arguments. Returns an interactive Moon dial (inline in Claude and ChatGPT; text summary elsewhere) with: • SVG crescent Moon showing real-time illumination percentage • Phase name and waxing/waning indicator • Current Moon sign with degree • Void-of-Course status with timing details • Lunar age (days in the synodic cycle) and days to the next New and Full Moon • The tightest applying lunar aspects CREDIT COST: 3 credits per call (phase + void-of-course + aspects, 1 each).explore_transit_timelineUse this when the user asks 'what transits are coming up for me', 'what's my forecast for the next year', 'when will Saturn hit my chart', 'show my upcoming transits' or 'what's happening astrologically for me in 2027' — a forecast they should SEE. Returns an interactive, date-ordered timeline (inline in Claude and ChatGPT; text summary elsewhere) of exact transit hits grouped by month — transiting planet glyph, the natal point it contacts, the aspect, zodiac position and retrograde markers — each clickable for a focused interpretation. Every hit carries its in-orb window (when the transit starts and ends, and which pass it is when a retrograde repeats it), and transits already in orb at the start are listed with applying/separating. ASPECT ANGLES: 0 = conjunction/return (default), 180 = opposition, 90 = square, 120 = trine, 60 = sextile. EFFICIENCY: searches run faster when transiting_planets and natal_points are given. MAX SPAN: Explorer/PayG 1y, Pro 5y, Startup 10y, Scale 40y (longer = 400). CREDIT COST: 1 + span price: ≤1y 5 (6 total), ≤3y 10, ≤5y 15, ≤10y 25, ≤20y 40, ≤40y 70.explore_vedic_chartUse this when the user asks 'show my Vedic chart', 'my Jyotish chart', 'what's my nakshatra', 'my sidereal birth chart', 'my rashi chart' or 'what's my lagna'. Returns an interactive South Indian fixed-sign Rashi grid (inline in Claude and ChatGPT; text summary elsewhere) with sidereal (Lahiri by default) placements, nakshatra with pada, navamsa and the Lagna (Ascendant) rashi; click any rashi cell for its themes and the planets placed there. Birthplace may be a place name (`location`). CREDIT COST: 3 credits per call (chart + render; +1 to resolve a place name).bazi_annual_pillarUse this when the user asks 'what element is the year of the Snake', 'what's the pillar, stem and branch or NaYin for my birth year' or 'what's the energy of this year' — a single-year lookup beyond the animal. Returns the year's Heavenly Stem, Earthly Branch, Chinese characters, zodiac animal, element, polarity and NaYin (纳音) resonance image for any Gregorian year 1-9999. CREDIT COST: 3 credits per call.explore_bazi_chartUse this when the user asks 'what's my BaZi', 'my Four Pillars', 'what's my Day Master', 'my Chinese astrology chart', 'what's my Chinese element' or 'my Chinese birth chart'. Returns an interactive Four Pillars (四柱命盘) explorer (inline in Claude and ChatGPT; text summary elsewhere): the Year, Month, Day and Hour pillars — each with Heavenly Stem (天干), Earthly Branch (地支), Ten God label and element color — plus the Day Master identity and a Wu Xing (五行) element balance bar; click any pillar for what it reveals about that life domain. CREDIT COST: 3 credits per call (1 base + 2 visual render).auth_loginUse this when the user asks to 'connect', 'sign in', 'log in' or 'link my OpenEphemeris account'. Returns a verification URL and code for the user to enter in their browser; the server then receives credentials automatically and every call is billed to that account (tier, credits, rate limits).auth_statusUse this when the user asks 'am I logged in', 'which account is this connected to', 'how am I authenticated' or 'when does my token expire'. Returns whether the server is authenticated, the linked account, the method (API key, JWT, device auth) and token expiry.- +27 more on the listing page
MCP Server Chart tools 27
generate_area_chartGenerate a area chart to show data trends under continuous independent variables and observe the overall data trend, such as, displacement = velocity (average or instantaneous) × time: s = v × t. If the x-axis is time (t) and the y-axis is velocity (v) at each moment, an area chart allows you to observe the trend of velocity over time and infer the distance traveled by the area's size.generate_bar_chartGenerate a horizontal bar chart to show data for numerical comparisons among different categories, such as, comparing categorical data and for horizontal comparisons.generate_boxplot_chartGenerate a boxplot chart to show data for statistical summaries among different categories, such as, comparing the distribution of data points across categories.generate_column_chartGenerate a column chart, which are best for comparing categorical data, such as, when values are close, column charts are preferable because our eyes are better at judging height than other visual elements like area or angles.generate_district_mapGenerates regional distribution maps, which are usually used to show the administrative divisions and coverage of a dataset. It is not suitable for showing the distribution of specific locations, such as urban administrative divisions, GDP distribution maps of provinces and cities across the country, etc. This tool is limited to generating data maps within China.generate_dual_axes_chartGenerate a dual axes chart which is a combination chart that integrates two different chart types, typically combining a bar chart with a line chart to display both the trend and comparison of data, such as, the trend of sales and profit over time.generate_fishbone_diagramGenerate a fishbone diagram chart to uses a fish skeleton, like structure to display the causes or effects of a core problem, with the problem as the fish head and the causes/effects as the fish bones. It suits problems that can be split into multiple related factors.generate_flow_diagramGenerate a flow diagram chart to show the steps and decision points of a process or system, such as, scenarios requiring linear process presentation.generate_funnel_chartGenerate a funnel chart to visualize the progressive reduction of data as it passes through stages, such as, the conversion rates of users from visiting a website to completing a purchase.generate_histogram_chartGenerate a histogram chart to show the frequency of data points within a certain range. It can observe data distribution, such as, normal and skewed distributions, and identify data concentration areas and extreme points.generate_line_chartGenerate a line chart to show trends over time, such as, the ratio of Apple computer sales to Apple's profits changed from 2000 to 2016.generate_liquid_chartGenerate a liquid chart to visualize a single value as a percentage, such as, the current occupancy rate of a reservoir or the completion percentage of a project.- +15 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Open Ephemeris
{
"mcpServers": {
"open-ephemeris": {
"command": "npx",
"args": [
"-y",
"@openephemeris/mcp-server"
],
"env": {
"OPENEPHEMERIS_PROFILE": "YOUR_OPENEPHEMERIS_PROFILE_HERE",
"OPENEPHEMERIS_BACKEND_URL": "YOUR_OPENEPHEMERIS_BACKEND_URL_HERE",
"OPENEPHEMERIS_API_KEY": "YOUR_OPENEPHEMERIS_API_KEY_HERE"
}
}
}
}
MCP Server Chart
{
"mcpServers": {
"antv-mcp-server-chart": {
"command": "npx",
"args": [
"-y",
"@antv/mcp-server-chart"
]
}
}
}
Frequently asked questions
Open Ephemeris is categorized under Aerospace & Astrodynamics and uses a local stdio subprocess. MCP Server Chart belongs to Data Visualization and uses a local stdio subprocess. Pick Open Ephemeris for aerospace & astrodynamics work and MCP Server Chart for data visualization.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Open Ephemeris has no declared pricing — check the project's own site. MCP Server Chart is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add open-ephemeris and antv-mcp-server-chart as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Open Ephemeris has a quality signal of 64/100 (Good) with 2 views, 0 installs and 5 GitHub stars. MCP Server Chart has 71/100 (Great) with 10 views, 0 installs and 4,402 GitHub stars.